Thanks for checking on that for me. I'm still thinking he may be "Thomas Mackey" who was in the 11th
Alabama Cavalry. Thomas had a brother-in-law Wesley Hamilton who was in the 11th Alabama, Co A.

And you are right, after Col Forrest was killed, the 11th operated with Gen Forrest.

He was dead when his wife applied for the pension so probably all she knew was - General Forrest, Company A. - Her brother Wesley could have told her that. He was still living.