An Infantry battle drill describes how platoons and squads apply fire and maneuver to commonly encountered situations. They require leaders to make decisions rapidly and to issue brief oral orders quickly.[1]
"Battle Drill", according to the manual Fieldcraft and Battle Drill, means the reduction of military tactics to bare essentials which are taught to a platoon as a team drill, with clear explanations regarding the objects to be achieved, the principles involved and the individual task of each member of the team.[2]
The Ranger Handbook defines a battle drill as "A collective action rapidly executed without applying a deliberate decision-making process". In modern US Military doctrine there are 8 battle drills.