These notes and the drawings come from a tour of field works Garvin attended, which was led by Major Rees. On this tour Garvin learnt how to create a loophole in a nine inch and in a 14 inch wall, how to conceal an abattis or field fortification, and the measurements for an effective overhead cover. Major Rees also stressed the need to use this knowledge along with their common sense as ‘trenching’ was not an exact science.
Tour of Field Works with Major Rees. D.S.O
(Commanded battalion during retreat from Mons)
In using a damaged lost house for sniping, keep sniping posts as far as possible in the shadow.
When you knock a loophole in a wall, splay it inwards:-
B A B A B A = header )
B = stretcher )
A B A B A B
B A B A B
To loophole a 9” wall knock out 1 header & enlarge gap by chipping.
From a 14” wall knock out first a stretcher, then a header. Smooth by chipping.
Abattis & similar obstacles demand concealment to be of value. Picket & wire down the tree-trunks