 Following the Civil War, Liscum was stationed in the American frontier and in the South during Reconstruction.In July 1898, Liscum, then a lieutenant colonel, commanded the 24th Infantry Regiment at the Battle of San Juan Hill.On the first day of the battle, he briefly commanded the 24th as well as the 9th and 13th Infantry Regiments following the wounding in quick succession of Colonel Charles A. Wikoff and Lieutenant Colonel William Worth.