The son of Arthur Biddle and Julia Biddle, was born in Philadelphia on April 19, 1890. He entered Yale College; and after receiving his degree in 1912, took a secretaryship under Colonel O'Brian, the United States Minister to Japan. In the summer of 1916 he received his Pilot's license at Essington. He was accepted for enlistment in the Foreign Legion, and was sent to the French Military Aviation School at Avord, where he received his brevet and graduated in a very short time. He was then sent to Pau for acrobatics, and on the thirty-first of July he was ordered to Plessis-Belleville for assignment as a battle pilot. On the seventh of August he was sent to Souilly, and afterwards to Dunkirk, where he was assigned to Escadrille Number 73, Groupe de Combat Number 12. On the eighteenth of August, while he was on a practice flight, his plane fell into the North Sea, from an unknown cause. Eight days later his body was washed ashore at Egmond-aan-Zee, North Holland, where the civil authorities reported that it appeared torn by shot.