 The Trans-Mississippi Department frequently used the name of the regimental commander in its official correspondence, especially for Arkansas regiments.The order of battle for the Battle of Helena lists a "39th Arkansas Infantry Regiment" in McRae's brigade, but this was actually Hart's 30th Arkansas Regiment, which was known for a short time as the 39th Arkansas.Hart's regiment was with McRae, and the real 39th Regiment was in Brig.