Here is an example from NARA, RG #109, Military Departments -- Letters Sent, Maj. Gen. T.J. Churchill's Division, January - May 1865
Chapter II, Volume 263 ½

Feb 9, 1865 Hqs Churchill’s Div, Camp Magruder-as the roads make it impossible to assemble the entire division, Gen McNair cdg division instructs Gen Tappan to have Pvt C. [H.] Simmons of Co B, 17th Regt shot tomorrow in the presence of your command.

Note: I believe the 17th Regt should read Hardy's Arkansas Regt