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MacArthur was the father of the famed general Douglas MacArthur, as well as ArthurMacArthur III, a captain in the Navy awarded the Navy Cross in World War I.
MacArthur left the Army in June 1865 and began the study of law, but it was not for him and he returned to his first love, the Army, in February 1866, receiving a commission as a Second Lieutenant in the Regular Army.
MacArthur led the U.S. 2nd Division, VIII Corps during the Philippine-American War at the Battle of Manila (1899), the Malolos campaign and the Northern Offensive.