There’s everything from interviews with Auxiliers, their training, the Operational Bases, the Special Duties ATS ladies, Memorial plaques, tours of bunkers, Auxiliary Units Headquarters, reenactors and a good deal of the shows we normally attend each year.
There are over 130 different videos up already, and this is a platform we’ll be looking to do more on this year inline with the new site.
Check out Churchill’s Secret Army on YouTube. Enjoy!
For the final day of the Festival of Archaeology, we are looking at some of our most recent projects. As yet they these do not have full or final reports but there are still interesting findings we can share.
At Nether Stowey we had the opportunity to briefly investigate an Operational Base that was already partially collapsed. The site was on a farm, and had proved an ongoing issue for the sites owners, as their sheep regularly found a way through increasingly expensive fencing and into the OB. Once there they struggled to extract themselves and over the years, more than one had ended their days there. The plan was therefore to bury the OB and prevent this happening. CART were offered the opportunity to investigate the OB prior to the site being buried. In this situation there is no need undertake a total excavation. Parts of the structure will remain intact for future generations to study. The purpose was to learn what was not immediately obvious. There was limited time, with a day or preparation and a day for excavation.
A draft report on the excavation details the findings. Whilst the main chamber was the typical elephant shelter, both the entrance and escape exit are different. See our images of the dig for more details. Possibly the escape exit may represent a later addition, although no specific proof of this was found. The end chamber is built from bricks, unlike the concrete blocks of the main end walls, except around the route to the escape tunnel. We have a couple of basic plans to show the layout, though the more formal plan was drawn up prior to the excavation so does not show the entrance that was identified. Creating detailed plans and reports is a lengthy process and just recently our new website has taken priority. However, hopefully this will indicate how the new website will be developing as we have the chance to complete and add this material online.
A final bonus from the excavation was the publicity in the local area regarding the excavation resulted in CART being given a copy of a photograph of the Nether Stowey Patrol.
Over a period of several weeks in 2019, CART, supported by Dorset Council and their wildlife volunteers with some technical support from the New Forest Community Archaeology team. From the first identification of the exact location by local resident Adam Dunn, to the extensive excavation and final interpretation board, has been quite a journey. Our initial report shows the difference from what we knew at the start of the year to now. The Ferndown Patrol report contains some of the images from this, another site which had an extensive ventilation system of glazed pipes, which was partially uncovered during the dig. Metal detecting and ground penetrating radar were both deployed in the initial stages to locate the buried structures. The former found the water tank with its concealed filler cap, whereas the latter was better for finding the shaft and the disturbed ground of the ventilation system. We are grateful to Gary Sterne of Maisey Battery for bringing his expensive kit and helping us out. Do check out his site in Normandy, for some very extensive digging and some remarkable associated historical research that is rewriting one of the central stories of D Day.
Our attempts to have a formal unveiling of the new interpretation board and the remains deliberately left extant were unfortunately foiled, first by severe storms this spring, then by the coronavirus pandemic! We would like to put on an event to show off the finds but perhaps that will have to wait for the 2021 Festival of Archaeology!
And as an extra bonus here is our colleague, John Wareham, instrumental in setting up the Ferndown excavations, with his video of the Auxiliary Units display built for a show season that won’t be happening. John is definitely our experimental archaeologist, learning how to remake items not built since the war.
Finally we bring you a short report from the Coleshill Estate. The team there have continued their investigation of the training structures at the site and have identified a new Operational Base there. This appears to be of a much earlier type than the previously known elephant shelter, being a box-like structure of corrugated iron on wooden beams. This may suggest that the design of OBs developed officially during the war, perhaps as more experienced Royal Engineer Officers became involved.
We hope you have enjoyed our brief tour through the archaeology of Auxiliary Units. CART continue to research the Auxiliary Units and new information has been forthcoming even during this week. New material is now being regularly add to our website, so do keep coming back to see. We would be keen to hear from anyone investigating Auxiliary Units sites of all types, anywhere in the country, to share what we have found and to help learn from our mistakes. We are grateful to those archaeologists, both professional and amateur, who kindly shared their research with us to share with you. Please contact us if you have any information about Auxiliary Units that you don’t see on this website already. We think we have included everyone who was involved, but we know there must be missing names.
Investigating buried structures using geophysical techniques has been increasingly common in recent years. It allows large areas to surveyed relatively quickly and uses differences in the responses generated by the buried archaeology and natural or fill materials to locate structures and identify their extent. If you have ever been confused by what it involves, Historic England have a straightforward explanation in their guide to research techniques.
The use of such techniques on Auxiliary Sites has been relatively limited. This may relate to the belief that the sites are identified and not recognising that elements of the structure may extend beyond the immediately visible OB, as we saw with the ventilation systems at Binnegar and Bromyards Downs in previous pages. Many structures are in woodland, where the application of the techniques are more difficult.
At Coleshill, a metal detecting survey and magnetometer was used to identify metallic targets for investigation. A ground penetrating radar was briefly trialed over the known demonstration Operational Base at Coleshill House and showed that it was detectable to the technique.
Subsequently a formal magnetometry survey was conducted by the short lived Churchill’s Underground War Group, at Langrish House in Hampshire, in an attempt to identify a possible Operational Base in the grounds. Nothing was found though documentary evidence has subsequently suggested the OB was elsewhere.
The Buckland St Mary In-station was known to have been built at Castle Neroche. The Castle was an Iron Age Hillfort converted into a Motte and Bailey Castle during the Anarchy period. Sergeant Arthur Gabbitas who documented the role of his Royal Signals colleagues in the Auxiliary Units Special Duties Branch was stationed there for a while. He left a brief description of the site. Historian and former Royal Signals Officer, David Hunt, visited the site in 2008, obtaining a useful first hand account of the location of the Operational Base, a “Zero” station for the the Chirnside Network, from a local resident who remembered it. His account included the presence of ventilation pipes showing like rabbit holes in the side of pits in Castle grounds. No remains could be found at the time but the site was recorded on the Somerset Historic Environment Record. There are separate records for the above ground Met Hut, which David remembered as still present during his own childhood visiting the site, and the Operational Base.
In 2017, CART arranged a visit to the site, to see if any evidence remained. David’s reports provided a focus for the search. The Met Hut base was measured and photographed. The location of the door could be identified. A search of the surrounding area found a small fragment of wire on the adjacent bank, twisted as if to connect to a terminal, perhaps for a battery. At the location identified for the Operational Base, fragments of glazed earthenware pipe were found, a feature often seen at such sites. A very careful search found a small hole near the edge of the bank with the top of two earthenware pipes just visible at its base, just a few centimetres below ground level. The earth had washed down into the pipes over the years, creating the hole. The pipes were almost certainly part of the ventilation system previously noted. Nearby an aerial tree was identified with fragments of the aerial feeder cable projecting from the bark. Because the entire site is a scheduled monument, no excavation of any sort was possible.
A report was prepared and submitted to the County Archaeologist who fortunately was interested enough to arrange for a further non-invasive investigation after obtaining the necessary permissions. Liz Caldwell from GeoFlo (www.geoflo.co.uk) was commissioned by the Southwest Heritage Trust, which was organised by Chris Webster, to survey the site. We think that this report represents the first time that an Operational Base was located by such techniques. With permission we include images from this report in an album of images form the site. The survey was conducted with a Fluxgate gradiometer (Bartington Grad 601-2 ) and Resistivity meter (TR/CIA Resistance Meter) processed with Geoscan Geoplot 3.00v software. The survey showed with a high degree of confidence the location of a structure underground, with a high magnetic signal, consistent with an elephant shelter structure. The ventilation pipes were not visible using these techniques.
On a repeat visit visit to the site, with a change in the conditions, a very shallow regular depression could be identified at the site identified by the non-invasive techniques. A further hole with a pipe junction was identified, in line with the first, supporting the interpretation of a ventilation system. Two aerial trees were identified. We do not believe there is a third extant tree at the site, though there is another tree with a lightning scar, an appearance that can look similar to an aerial scar. As both aerial trees and lightning strikes are located on high ground they can exist in close association.
Coming right up to date, a group from Keele and London South Bank Universities have published a pre-print paper utilising several techniques, namely, Ground Penetrating Radar (GPR), Resistivity, Conductivity and Metal detecting across three Operational Base sites, one intact, another collapsed and a third destroyed to test the modalities. Metal detecting proved valuable in locating the site of the structures, with GPR showing extant chambers and depths. The other modalities also produced useful information and allowed the construction materials to be identified. This is an interesting proof of concept study and suggests that the study of buried structures of the Auxiliary Units with non-invasive techniques is both useful and practicable. We look forward to further investigations of this nature.
When it comes to Auxiliary Units excavations in Sussex, CART has been fortunate to receive information from others doing the hard work on the ground.
The Operational Base for the Warningcamp Patrol is a rather unusual one, with a box like structure of corrugated iron let into solid chalk, with heavy steel joists supporting the roof. Though there is no documentary evidence, the general consensus has been that such box like structures represent the earliest phase of Operational Base (OB) construction. The more familiar Nissen hut like elephant shelter appears to date from late 1941 based on a plan dated to the end of that year.
In 2014, the Sussex Military History Society conducted a comprehensive excavation of the site. This revealed a good deal of the structure and fittings of the OB. We can’t bring you the full report on this one but there are a few photos on our report on the Warningcamp Patrol provided by one of the diggers. There is a photo of one of the others mid-dig here, but please don’t be distracted by his excellent website on the Pillboxes of Sussex!
A couple of videos give a good overview of the site.
And mention of the Last Cowboy in Sussex, means we really have to share another Sussex link with you, not least as as it shows what the CART website once looked like. It can justifiably be included here as it shows a single find from the site!
The National Nature Reserve of Kingley Vale had been rumoured to be home to an Operational Base for the West Stoke Patrol. The South Downs National Park project “Secrets of the High Woods” utilised volunteers to investigate further. Oral history and a map marked up by a former site ranger provided clues for further fieldwork. An early report includes an images of the Observation Post.
Section 5.4 Modern on page 54 of the report documents the findings. The oral history account has moved since the report was written, with the extract, “They are the size of a house underground.”, discussing the OB while still accessible. The full Secrets of the High Woods document contains very little about the Auxiliary Units, but plenty of archaeology, with great LIDAR images from the project. It is included here for one CART member with a particular interest in OB water tanks – pictured on page 152.
You may have noticed the name of Mike Kallaway in the previous reports and he appears again as pone of a team from the Chichester and District Archaeology Society to bring us a very detailed report on the OB in Houghton Forest, most likely to have been used by the North Stoke Patrol. We have also been provided with an series of additional images of the OB showing more of the details described in the report. Note the very detailed LIDAR data with 0.2 m contours, but that the OB remains undetectable.
This OB differs from the Binnegar OB we saw earlier in the week, though shares an apparently similar basic structure. The main elephant shelter is set on a low wall. A shaft provides an entrance. The end walls are built from corrugated iron, and as is the case in the Hougton Forest OB, these tend to collapse more readily under the weight of soil. Both have ventilation systems, though at Houghton this appears limited to just four pipes. The drawings show all entering the top of the OB, though design elsewhere might suggest that perhaps those in the missing end wall might have run to nearer floor level. In addition they are made of cast iron rather than the glazed pipes seen at Binnegar. This seems to point to a slightly more basic design, perhaps suggesting an earlier build. The Sussex Auxiliary Units were among some of the earliest patrols to be set up. Alternatively this may simply represent the differences between different units undertaking the construction work, using the materials they were familiar with. In some parts of the country, escape tunnels appear to have been a later addition. In this case the loss of the end wall makes it difficult to determine if this was an original feature or later addition. There remains much to be learnt from a careful study of the construction of Operational Bases, matching that with the limited records of construction, to try and understand the development of their design over the period 1940 to 1944. The level of complexity varies widely, not withstanding local solutions to specific problems such as the waterproof box designs used on the low lying Romney Marshes in Kent. Plenty of scope for further research, which will be aided by careful recording of what remains available for study.
Tomorrow we will take a look at a the use of geophysical techniques to search out Operational Bases.
After having presented some large scale projects, its time to recognise that not every archaeological excavation needs to be on this scale. The two projects described here are on a smaller scale, but produced very useful findings.
In Herefordshire, the Bromyard Downs Project undertook an investigation of two possible Auxiliary Units hides identified from oral accounts. One consisted of nothing more than a depression in the ground. The other was only approximately located. Metal detecting revealed a possible locaiton for the latter and the presence of some concrete blocks.
The findings confirmed the oral history of the area. In this project we saw that even the history of the site from the 1970s and 1980s had been lost. One OB had been intentionally destroyed. However, with only the entrance shaft excavated, it is not impossible that some significant part of the main structure remains. A number of sites have been found where the entrance shaft was lowered and filled in, while leaving the main chamber of the structure intact.
CART undertook a small excavation on private land near Puddletown Forest, near Dorchester in Dorset. The location of the Operational Base had been identified by the landowner, who invited CART to investigate, though there were few visible remnants to see at the start. This excavation identified a section of brick wall, at the entrance to the OB. In other areas there was little apparent, but careful excavation revealed the remains of corrugated iron sheeting placed vertically. Groups of nails were found in clusters with occasional fragments of wood preserved where the iron had leached into the wood from the nails, slowing its decay. The original wooden framework had rotted away, as had the majority of the corrugated iron. Changes in colour and texture were all that identified the edges of the structure and where the corrugated iron walls had been.
Nearby in a large hollow, a number of .45 calibre cartridge cases and bullets were found. Possibly from a Thompson Sub-Machine gun, these might have been the result of practice by the Auxiliary Units men. However, the US Army also trained in the area and used the same weapon, so could also have fired this weapon here. The presence of 1942 dated .300 rifle rounds supported the latter interpretation.
Excavations are not complete at this site, but current findings suggest that the structure was a box like underground hide built with a wooden frame. When the area was planted as forest, after the war, the weight of the trees above the OB appear to have caused it to collapse.
We have a small gallery of this excavation for you to view.
Tomorrow we look at Sussex and the work of Chichester and District Archaeology Society there.
And when Scheduling sometimes may not be the best approach
Normally when we find out about a site it is because someone is inviting us to take a look, or because hunting for a location we have come across the owners. Almost all of the time they are keen for us to come and visit, take a look around the remains and record what is left, and explain how it was it used. The Salisbury In-station site has been a bit different.
We first became aware the site in 2001 from letters from the late Bert Davis, a member of the Royals Signals team who helped fit it out, shortly after the OB was built. He provided an approximate location but the Foot and Mouth epidemic rather limited countryside access at the rime. An initial reconnaissance in 2003 revealed it was in publicly accessible woodland managed by the Forestry Commission. Contact with them revealed that they were very much aware of the site, not least as a contractor had previously put the wheel of their tractor through the roof and damaged it. Subsequently they had fitted bat grills to the entrances and reportedly bats were in residence. Since disturbing bats, for example by flash photography, flood lighting or indeed simply a noisy presence is illegal, they were understandably reluctant to allow access.
In 2013 CART was approached by a local resident who had found the site simply through walking in the area. We visited the site and did not enter, but recorded what could be seen above ground. At around the same time, a group of “urban explorers” visited the site, reportedly broke the locks off of the bat grills and entered, taking photos and video of the site. These were posted online, making the existence of the site public knowledge. With a lot of images it was clear this was a site in remarkably good condition, with a large part of the original fittings in situ. It was also significantly larger than most other “Zero” In-stations, which tend to follow a similar design. The transcription of the Beatrice Temple Diary at about this time included reference to this site as a “Superzero” indicating it’s special nature. Attempts were renewed to see if officially sanctioned access would be possible but came to nothing.
In 2014, independent of CART, a submission was made to have the site scheduled. There is no doubt that it is deserving, being in a good state of preservation and being unique even among other surviving Auxiliary Structures. The application was successful and the listing can be read online.
When the Defence of Britain Project was compiling lists of wartime sites in 1995-2000, one intention was to use the results to schedule a selection. Discussions around that time reflected that scheduling provides little in the way of benefit to a site in secure ownership, but does allow prosecution in the event of deliberate damage. For Auxiliary Units OBs, their survival has often been the result of not being widely known about. Keeping a site secret cannot protect from a major road being built over it, or a housing development. However, they are rarely placed in locations where this is a real risk. One of the results of scheduling a site is that its location is revealed. In the case of the Salisbury In-station, this meant an 8 digit map reference was put online, making it easy for anyone with a GPS system to locate the site with no other knowledge. In addition a supplemental “Heritage Highlights” press release included images of the site, in case of any doubt
Subsequently the site has been revisited repeatedly by urban explorers, damaging locks and indeed breaking the grills beyond repair in order to gain access. Understandably for those tasked with the care of the site, this is a major problem. They know there are risks to entry, this is a confined space and parts of the structure have been damaged. Images from within show the presence of asbestos boards in use for internal dividers with some of these damaged. The law places the responsibility on the owners for the safety even of those who break in. Scheduling doesn’t appear to have helped this site, except to make it more more widely known.
How to record a site when you can’t get in?
CART Researchers have visited the site on a number of occasions. We have surveyed and recorded those elements visible from the surface. This includes not only the entrance shafts, but the presence of ventilation pipes on the surface. Some items removed from the interior by visitors have also been recorded on the surface. The surrounding area was examined for the presence of aerial trees, but all the trees in the surrounding area appear too young. The site was felled in the past and it was during logging that a contractor vehicle damaged the roof of the entrance chamber. CART researchers also identified the location of the above ground hut, which does not feature in the scheduling. It has also been identified that the orientation of the structure on the scheduling report is incorrect.
In addition information has been collected from the illegal access recordings available online. Using these, Matt Brazier has produced an excellent 3D walk through. This can be seen on the Salisbury In-station page.
This is why we are happy to talk about this site at this point, as it is obviously already common knowledge, and presumably for every visitor that posts a video online there have been a number of others
It is clear at both this an other sites, that repeat visits can mean new findings come to light. As the vegetation differs with seasons or weather, different elements become more or less obvious.
CART continue to work towards the goal of being permitted to safely document the interior of this site. We have engaged in a positive dialogue with the site managers and we hope our determination will pay off some time soon. We have worked to identify periods when entry would not result in bat disturbance and the requirements for safe access, both in terms of confined space working and asbestos risk management. We have explored the possibility of remote access with drones or remote controlled vehicles. If access ever is possible, we want to record it in as many ways as possible to make the most of the opportunity. Not just with photos or video, but detailed measurement or ideally 3D scanning to ensure the site is recorded comprehensively. We would be interested to hear from anyone with skills in those areas who might wish to cooperate either in providing the relevant schemes of work or risk assessments or later in any investigation. It would be a shame if this site if further damaged or decays without being properly recorded. At present the only records have resulted from illegal access which surely is not what was intended by those creating the relevant legislation. From CART’s perspective, doing the right thing may take longer but we hope that is of more benefit in the future in relations with other landowners than earlier access to a single site, no matter how interesting.
Following the most visit video, all the entrances have been welded shut to prevent access.
Tomorrow will be looking at some smaller scale projects with interesting findings.
CART are approached from time to time about excavating Operational Bases. We are not too enthusiastic unless there there is a good reason to. It is an awful lot of work to properly excavate one. When we were asked to advise about an Operational Base found during an archaeological survey at Binnegar Quarry in Dorset, we certainly didn’t realise the scale of the project. We were fortunate to have professional archaeological advice from Andrew Joseph Associates and a great deal of support from Raymond Brown, the quarry contractors. The site was due to be totally destroyed by quarrying and the state of the surviving remains of the Operational Base meant that it was not a candidate for scheduling and preservation. The County Archaeology Service and Historic England were consulted and approved the plans.
At first glance there wasn’t a great deal to see. A long depression in the ground and the remains of one shaft with a more intact one at the other end. The whole area covered in rhododenon, meaning that LIDAR was ineffective. We have been looking to see if was possible to use LIDAR to locate OBs in woodland, as the technique allows a ground map to be created even through tree cover – except when there is rhododendron growing! CART produced an initial report. (more on LIDAR later this week)
Raymond Brown kindly arranged to clear the rhododendron for a professional survey to be done. This revealed earth banking around the site not immediately apparent to the naked eye. It is clearest on the cross section profiles. An initial metal detecting survey was undertaken of the immediate area prior to excavation. This identified a number of finds which were plotted on the initial survey. All were located around one of the shafts with nothing around the other end. We utilised metal detectorists with specialised expertise in military ordnance and everyone working on the site attended a briefing about the recognition of potential ordnance risks and the process for site evacuation and calling in experts in safe disposal . Finds of live ordnance material are unusual on Auxiliary Units sites, but not unheard of, as the Coleshill Uncovered project demonstrated. Fortunately, while a number of booby trap devices, fitted with explosive caps, were discovered, all showed clear signs of having been fired. No live ordnance material was found on this OB site at any stage. Finds images.
Subsequent to this the collapsed area over the main chamber was excavated in alternating blocks to create sections. Once these had been recorded, the corrugated iron roof was cleared. This revealed that the roof was crumpled down and overlapping, but with evidence of the centre of the roof having been removed – evidence by the lack of in situ bolts. Later a number of these were found in a pile at the site of the OB, at the base of a tree stump.
Clearance of the open shaft uncovered the remains of the counterweight at the base of the shaft. The other shaft could not be fully excavated initially due to the confined space and danger of working within it. The sections developed during this stage revealed that the OB had been deliberately filled with sand from the northeast end shaft. It was subsequently confirmed that during a previous phase of gravel extraction the then operators had done this to prevent access by children. At that point the sand was considered a waste material. We appreciated that they had used sand as it made the digging much easier!
One of the major features uncovered was the extensive ventilation system. Runs of glazed earthenware pipe with concreted joints were found heading in all directions from the OB, with evidence of pipes entering the roof and also the lowest level of the floor. There was a larger pipe running down the outside of the OB the take air to the floor level and hollow concrete blocks were found which had been used as ventilation in the centre of the roof, similar to those seen at the intact Beaminster OB. The album of images has an awful lot of images of pipes! Where we found intact runs, the pipes had been embedded in sand and at the end there was evidence that there had been a wooden box – perhaps with a mesh cover. There was also a deliberate up then down down arrangement to stop water running down the pipes into the OB. it appeared that the prevailing wind was used to assist cold air to the base, with the warm air rising through the roof, to create a flow inside. The only other location we know where the pipe work has been similarly excavated is at the Bewley Down Outstation, which is documented in the book “Chirnside 1” by Hugh May. Those excavating OBs should be aware of how far around the obvious structures, the ventilation system may reach. Excavation Images
The NFNPA also helped by processing our photogrammetry images into this model hosted in Sketchfab
Following a week of excavation, the site was backfilled, allowing the clearance of the trees form the site and removal of remaining vegetation. A further metal detector survey was then undertaken over the wider area now exposed which made numerous finds of booby trap devices, again all having been fired. They were largely clustered in one area again, suggesting possible training at a distance from the OB. We we also received support as a group throughout this project from the New Forest Community Archaeology project, funded by the Heritage Lottery Fund. This included help with processing some photogrammetry images and training in the use of the QGIS plotting system which we put to use in plotting the new finds.
We returned to complete the excavation of the shaft and tunnel section. This was undertaken by digging out around the shaft and then breaking away the concrete blocks, level by level to allow excavation of the interior. This was a truly massive undertaking, and would have been impossible without the excavator provided by Raymond Brown. Using this method meant we could identify the extents of the original hole dug to install the OB and also identified a soak away system for drainage. Bitumen felt had been used to damp proof the exterior of the structure.
Clearing the shaft revealed very little in the way of finds until almost at floor level, when, in a moment that that could have graced a Time Team episode, numerous finds appeared in the last metre of infil of the shaft and tunnel on the final day. This included remnants of the counterweight hatch system, and boxes of booby traps devices, specifically Pull Switches, Pressure Switches and Time Pencils scattered through the fill. All had been dismantled to remove the small explosive caps. Possibly this was done by members of the Patrol to make the devices safe. While they might have been found by children at a later date, the systematic way they had been dismantled with none in a fired state suggests a deliberate action. Within weeks the entire area had become a 20 metre deep sand quarry with no trace of the OB surviving. Finds Images
We had hoped to mount an exhibition of the finds nearby this year, but have not been able to do so as a result of the covid-19 pandemic.
We learnt that fully excavating an Operational Base is a major undertaking, even with big machinery and plenty of personnel. The ventilation systems can be extensive and extend far beyond the main structure and may need to be excavated first to allow heavier machinery to approach without causing damage. A full excavation should really only be undertaken when the structure is likely to be destroyed in order to “Preserve by Record”. Excavation is a destructive process and if not carefully recorded then information is lost forever. We are still working on a comprehensive write up of this project to fully record all that we found. The final result will be lodged with the Dorset County Archaeology Service. Raymond Brown kindly donated the finds to CART for use in future displays and also printed an article on the project in their company magazine. CART would like to thank Raymond Brown, the New Forest Community Archaeology Project and Andrew Josephs Associates, for all their assistance.
CART’s first archaeological project investigating the Auxiliary Units was Coleshill Uncovered.
As the headquarters of Auxiliary Units Coleshill House and Estate was known to have housed the training facilities and hosted many Auxiliers through the war. However the only previous investigation had been by the Ridgeway Military and Aviation Research Group (RMARG). They had made some significant finds, not least the demonstration Operational Base. They excavated the escape tunnel which had collapsed, creating a walk in entrance. They also found an observation post and possible ammunition bunker.
Coleshill Uncovered took a variety of approaches;
The underground water tunnels, reportedly used by Auxiliary Units, were investigated
A survey of the site identified a number of structures not previously recorded.
Metal detecting revealed evidence of training and men living at the site.
Using a magnetometer allowed the OBs and demonstration hatches to be found.
Excavation revealed details about surviving structures that indicated their design and construction.
Some of the highlights were;
The discovery of a bayonet concealed in wall close to where the escape tunnel of the demonstration OB exited. Once a stone was removed it could be retrieved. It is thought this was was part of the demonstration of how to prepare for the worst, but it is remarkable to think this had stayed on place for so long.
The uncovering of a number of demonstration hatch covers, showing the range of designs in use. It was remarkable to be able to match one of these to the plans handed out as part of the Patrol Leader’s Course at Coleshill to men from across the country
Being able to see the internal layout in one of the Nissen huts due to marks left on the concrete floor, once a mat of vegetation had been rolled back
Finding identifiable fragments from an aircraft and a German artillery piece, which confirmed verbal accounts of Coleshill in wartime which had been recounted to the National Trust staff by visitors over the years.
CART hosts the reports from this series of studies and also images of all the finds