25.4.18 ESSARS SECTION: Enemy quite. Slight harassing fire carried on at intervals and some trench mortaring of our left subsection. The trenches in this sector are shallow and there is no movement allowed in front of Battalion HQ by day as there is no cover. Trenches cannot be dug more than 2 feet deep as the ground is waterlogged.
139 Infantry Brigade: Headquarters War Diary [WO95/2692]