Anybody watching that? Who is the crazy old guy supposed to be, who survived the siege at The Alamo and has waged a personal guerrilla war with the Mexicans? (and maybe the Comanches, they haven't got that far yet.) I don't think they've given him a name. Maybe he is just a stock character Anonymous PTSD Soldier.
AFAIK, Mrs Dickinson was one of the only survivors, and a negro named "Jim" (didn't have a last name) was the only actual combatant who survived -- not counting Seguin and various couriers who left before the last battle.
I know it's part history and part fiction, but they are not making clear which is which.