Montrion joined the army in 1914. A combat infantry veteran, he transferred to the aviation service and began flight training on October 9, 1916. Assigned to N48 on April 6, 1917, Montrion scored eleven victories before he was killed in action on June 28, 1918.
"Incomparable pilot, audacious, adroit and very brave. On September 30, 1917 he shot down two enemy planes, bringing therewith the number of his victories to seven. Cited in orders six times." Médaille Militaire citation