His older brother , Ephraim Kirby Smith , a captain in the regular army , served with him in the 5th U.S. Infantry in both the campaign with Taylor and Scott , until he died from wounds suffered at the Battle of Molino del Rey in 1847 .
His older brother , Ephraim Kirby Smith , a captain in the regular army , served with him in the 5th U.S. Infantry in the campaigns with both Taylor and Scott . 
 Ephraim died from wounds suffered at the Battle of Molino del Rey in 1847 .