For the infantry, drums were used to announce daily activities, from sunrise to sunset. Reveille was sounded to begin the day at 5 AM, followed by an assembly for morning roll call and breakfast call. Sick call was sounded soon after breakfast, followed by assemblies for guard duty, drill, or to begin the march. Drummers were also important on the march to keep soldiers in step during parades and to call them to attention. In battle, drums were sometimes used to signal maneuvers and give signals for the ranks to load and fire their weapons. The artillery and cavalry relied solely on buglers who were as important in their roles as the drummers were to the infantry. When not playing for their respective regiments, musicians were often combined with regimental or brigade bands to play marching tunes or provide field music for parades, inspections, and reviews.