See
Bates, p.186
general order 18, HQ 91st PA, 8 May 1862
general order 49, HQ 91st PA, 11 September 1862
the schedule in general order 51, HQ 91st PA, 7 October 1862
the schedule in general order 4, HQ 91st PA, 13 August 1863
even regimental commanders were tested--see brigade order received 10 Sep 63, about "the recitation in tactics by regimental commanders to the brigade commander"
the schedule in general order 4, HQ 91st PA, 4 March 1864
the schedule in general order 11, HQ 91st PA, 14 Sept 1864
the schedule in general order 15, HQ 91st PA, 5 Nov 1864
the schedule in general order 1, HQ 91st PA, 25 Jan 1865
the schedule in general order 6, HQ 91st PA, 10 Sep 1863
general order 2, HQ 91st PA, 7 March 1864