jay dubaya Posted 18 January , 2021 Share Posted 18 January , 2021 It's a new one on me... Bouilly Crossroads MC - Soissons. 22 4.K.77.42 Bouilly Crossroads MC - Joncherry S/Vesle. 220.6 x 273.7 I regonise the latter as the Lambert grid system and I'm somewhat familar with this format. However, the former has me stumped, any help would be greatly appreciated. Jon Link to comment Share on other sites More sharing options...
TEW Posted 19 January , 2021 Share Posted 19 January , 2021 Jon, This is so far East there are no normal 'front' trench maps. Soissons 22 is a map sheet on Mcmaster, Bouilly is in rectangle K 4 (red figures in margin). Same process as trench maps to define 77/42. Sub-divide the rectangle into 10 parts then 7.7 units across from SW corner of K4 meeting at 4.2 units up from ditto. NB. It is a map at 1:100,000. A clever person could tell you the area covered by that grid reference as it only defines the SW corner of what I suspect is quite a big rectangle. I can't really even estimate which of the two cross roads is the correct one. Bouilly crossroads MC has come up on forum before. A better location or map may be available. http://digitalarchive.mcmaster.ca/islandora/object/macrepo%3A4323 TEW Link to comment Share on other sites More sharing options...
Open Bolt Posted 19 January , 2021 Share Posted 19 January , 2021 This is sheet 22 Soissons with a square 4K. [I claim no expertise and sadly do not recall the source] This is 4K with Bouilly. File is 51MB Apologies - TEW has the source Link to comment Share on other sites More sharing options...
TEW Posted 19 January , 2021 Share Posted 19 January , 2021 There is a link to smaller scale map in this post. Scroll down. If that link doesn't work go to ancestry diaries. Enter 2874 in keyword box hot search and click on first instance of 153 Brigade diary then jump to page 617. You'll see the original version has the rectangles shown on Soissons 22 but is also overlaid with red squares of the Lambert? system. Image sourced from Ancestry Diaries. TEW Link to comment Share on other sites More sharing options...
WhiteStarLine Posted 19 January , 2021 Share Posted 19 January , 2021 This doesn't add any detail but it is confirmed as the Depot de la Guerre Projection Lambert, with a January 1917 magnetic declination printed on an 1889 map, so they probably didn't have a lot to go on near Reims. Credit: IWM & WFA Link to comment Share on other sites More sharing options...
WhiteStarLine Posted 19 January , 2021 Share Posted 19 January , 2021 Same image source, looks like the same map but it is printed in German and marked as 1918. Credit: IWM & WFA Link to comment Share on other sites More sharing options...
jay dubaya Posted 19 January , 2021 Author Share Posted 19 January , 2021 Thank you folks, that is indeed really helpful. I did download a nettle map from the 153 Inf Bde but couldn’t work out the coordinates. The original reference came from exhumations carried out post 1921 up to 1933, I’ve never seen such coordinates before and did wonder about the availability of maps during this period. J Link to comment Share on other sites More sharing options...
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