Intrenchments
Free to read here, from Project Gutenberg.
Training for the Trenches
Elements of Trench Warfare
Handy War Guide for My Company: Handy Company Commander's Guide
Trench Warfare: A Manual for Officers and Men
Specimens of British Trench Orders
Tactics and duties for trench fighting
The Attack in Trench Warfare: Impressions and Reflections of a Company Commander
Notes on Training for Rifle Fire in Trench Warfare
Bombers' Training, and Application of Same in Trench Warfare
