Thank you Art. In all the information I've found, there are lists of them being dismounted, but I couldn't find the time or reason. I appreciate your reply very much.
As a surgeon with the TransMissippi, would it be correct to say he probably would have stayed with his regiment, or might he have been ordered elswhere? How do I find out which battles he was in?
His capture roster paper from the National Archives says he was captured (history says they surrendered) at Fort Hindman with [Captain Nutt's] "Red River Rangers, Cav., La," with a note in different handwriting above that saying "Denson's [--something I can't read].
He joined for duty and enrolled with Capt. W. B. Denson's Cavalry Company, Unattached Brigade, for a period of 3 years. A note on that paper says that Denson's became the 6th Cav. La. But I found a map of that battle where Harfield was captured, and Nutt's Red River Rangers, Cav., La., are shown on it.
Then, the National Archives roster report of him being at Gratiot Street Prison[er of war hospital] says he was "asst. surg. Garland Brigade," captured "Arkansas Post Ark [which is also called the battle of Fort Hindman] the day they all surrendered, January 11, 1863, and under remarks it has "Memphis, Tenn."
Capt. Nutt's unit was combined into the 6th LA Cav at some point too,and it does show them fighting a lot of battles in Tenn.
But I'm getting kind of confused. I'd really like to be able to have a definative list of who he was with and where he fought, or doctored.
Anyone have a brilliant plan for me to find all that out?