Buglers were expected to be excellent horsemen as they played “calls” during battle. While in camp, bugles signaled activities throughout the day e.g. Assembly, Roll Call, Stable Call, Mess Call, Water Call, Fatigue Call, Attention, Retreat, and Tattoo.
Gerald Keating. “Buglers and Bugle Calls in the U.S. Army,” Army History, No. 27 (Summer 1993), pp. 16-18
Daily Sequence of Calls (6:47) YouTube, August 19, 2015
Civil War Bugle Program (31:35 — program begins at 2:30) YouTube, June 29, 2014