My great-grandfather was Sgt. James M. Scott (promoted lieutenant in 22nd Indiana Artillery for his heroism at Lone Jack); according to the published order of battle (see article at Wickipedia) the unit had as follows:

"3rd Indiana Artillery (1 section of two 12-pounder James Rifles) -- Lt. J.S. Develin/Sgt. James M. Scott, 36 men"

The Union order of battle, officers and strengths was taken from Banasik's "Embattled Arkansas".