The 4 maps in the possession of Percy Woollard as Sergeant in Royal Army Service Corp
Presumably Transport Section.

The wiggly red line running North South is the approximate line of the front.

These maps are titled English Ordinance Survey Maps or War Office
with a scale of 1 cm to 1km or 1 inch to about 1.6 miles.
Dated  1915 0r 1916