The maps in this category are designed so that multiple sheets can be put together to cover a larger area, the Library has some examples of such composite sheets, however, all the sheets shown here are single sheets.
The maps include large-scale trench maps which show the actual trench network, though usually only the enemy trenches. These maps would have been used in the trenches for operational use and for calling down artillery fire using the grid with which they were overprinted. The information on these maps was a mixture of original survey in the field and information copied from pre-war French and Belgian maps of the area.
In addition to these large-scale maps, smaller-scale maps were also produced for use in planning and for administrative purposes.
Official/Military maps Series
C21:a (4): France and part of Belgium