In his everyday life of drill and maneuver, the Huachuca soldier was guided by his Army's manuals. Field Service Regulations for 1914 contained in a thin, pocket-sized edition the fundamentals of soldiering in the U.S. Army, ranging from entries on Flank guards, Use of machine guns, Sanitary service, Requisitioning military railways, to Signals and codes. Combat is divided into two general classes, the offensive and the defensive. The defensive is divided into the purely passive defense and the temporary defense, which has for its object the assumption of the offensive at the first favorable opportunity. Decisive results are obtained only by the offensive.
Aggressiveness wins battles.
The purely passive defense is adopted only when the mission can be fully accomplished by this method of warfare. In all other cases, if a force be obliged by uncontrollable circumstances to adopt the defensive, it must be considered as a temporary expedient, and a change to the offensive with all or part of the forces will be made as soon as conditions warrant such change. Unity of command is essential to success. The regiment united in combat has greater force and fighting power than have three separate battalions. A battalion acting as a unit is stronger than are four companies acting independently.