Here's just a little more info, concerning his service in the Mexican-American War:

SECOND DIVISION
Commanded by Brig.-Gen. Twiggs
Smiths Brigade
The Third Regiment of Cavalry, Mounted Rifles

Capt. Stephen S. Tucker, Co. K, wounded at Chapultepec, Mexico on the ramparts of the city at the Belem garita, [apparently on September 12, 1847].