Tactics and duties for trench fighting
Chapter II
Development of a Position from an Open Warfare Battle
=General Use of Fortifications=—Change from Battle Lines to Trenches of a Position—=Division of a Position=—Different Lines of a Sector—=Principles of Organization=—Flanking Fire—Field of Fire—Location of Trenches—Compartments—Concealment—=Elements of Organization=—Plan—Outline of First Line—Cover Trench—Advance Posts—Loopholes—Traverses—Transversals—Support Trenches and Redoubts—Boyaux and Communication Ditches—Accessory Defenses— Command Posts 34