By order of the Secretary of War: [Illustration: Adjutant General.] CONTENTS Chapter I Organization of the Company for Battle Formations PAGE =Specialists=—Organization of a Typical Company—=Use of Specialists=—In the Defensive—In the Offensive—=Formations=— Initial Formation—Close Order and March Formation—Approach March—Skirmisher Line—Assaulting Formations—Composition of Lines—=Drill Regulations= 1 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 Chapter III Sector and Trench Duties =Plan of Defense=—Definition—Principles—Form of—=Details of Trench Duty=—Guard Duties—Sentinels—Reconnoitering Patrols—Observers— Attrition—Fighting Patrols and Raids—Arms, Equipment, and Ammunition—Activities of the Troops—Reports—=Use of Infantry and Artillery Weapons, and Liaison=—Machine Guns—Trench Mortars— =Artillery Support=—Use—Barrage—Liaison—Instructions for Sentinels—Watchers—Observers 62 Chapter IV The Relief =Definitions and Principles=—Kinds—=Preliminary Dispositions for the Relief=—Time to Prepare—Preparation—Reconnaissance—=Relief Orders=—General—Battalion—=Movement of the Relief=—Departure— March to Rendezvous of Guides—Guides—March in the Boyaux— =Occupation of the Position=—Duties after 104 Chapter V Defense of a Position