Robert F. O. Boswell enlisted in Company K as a 1st Sgt on 5 July 1862 at age 17. Mustered on 8 Oct 62. He was promoted to 1st Lieutenant of Company F from 1st Sgt on 19 Oct 1864. 6th Tennessee Cavalry. Don't see any indication he was a captain.

The only other Boswell in this regiment was Thomas H Boswell, Captain of Co K, age 29, enlisted on 15 July 1862. Co K mustered in at Dresden, TN in July 1862. Men in Co K were mostly from Weakley County. Thomas was promoted to OFC Major on 20 Aug 1863, and his resignation was accepted on 26 Oct 1864. He was seriously wounded at Salem, Mississippi Oct 8, 1863. "Hurst's Wurst" says he was born in Wilson Co, TN 1833 and was a merchant before the war.