George W. Callahan was born on June 11, 1862, the son of James F. and Susan Avery Callahan.
He was born in Chambersburg, Pa., in a city connected with one of the iconic events of the Civil War. On Oct. 10-11 of that year, intrepid Confederate Gen. J.E.B. Stuart led his cavalry on a two-day, 100-mile raid of the city. He attempted to cut Union Gen. George McClellan’s supply lines in a prelude to the Battle of Gettysburg, which would occur the following July.