Tactics and duties for trench fighting

"Tactics and Duties for Trench Fighting" by Georges Etienne Bertrand is a manual that explains how to fight in trenches. It was created in the early 1900s. The book looks at the job of different soldiers and how they were organized, along with explaining the rules and plans used in trench warfare, especially during World War One. It gives advice to soldiers about how to use different jobs like grenadiers, riflemen, and machine gun crews. It also talks about formations and the best ways to fight, either attacking or defending, to win but keep soldiers alive in tough trench conditions.