The Infantry Drill Regulations, United States Army, 1911, corrected through 1917, is the official manual that governed how American infantry marched, maneuvered, and fought on the eve of the First World War. Issued by the War Department, it prescribes the close-order drill, extended-order formations, and combat principles expected of every soldier and unit.
The regulations cover everything from the school of the soldier and the manual of arms to attack, defense, and the deployment of squads, companies, and battalions. As the army expanded for war in 1917, these pages shaped the training of millions of recruits. For military historians and reenactors, the document is an authoritative primary source on American tactical doctrine of the period.