According to John McAulay s "Civil War Pistols of the Union" the 7th,11th, &13th were partially armed with Whitney Revolvers. Colt's partially in 1st,2nd,3rd,8th,8th,10th,11th,& 13th. Remington --2nd,5th,8th,10th &15th. North Savage- 6th,10th &13th.Starr-- 10th, 13th & 16th. So I guess whatever was available at the tine.