19 May 1918 — Flirey, France
The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Distinguished Service Cross to First Lieutenant (Air Service) Douglas Campbell, United States Army Air Service, for extraordinary heroism in action while serving with 94th Aero Squadron, 1st Pursuit Group, U.S. Army Air Service, A.E.F., on 19 May 1918. First Lieutenant Campbell attacked an enemy biplane at an altitude of 4, 500 meters, east of Flirey, France. He rushed to the attack, but after shooting a few rounds his gun jammed. Undeterred by this accident he maneuvered so as to protect himself, corrected the jam in midair, and returned to the assault. After a short, violent action, the enemy plane took fire and crashed to the earth.
War Department General Orders No. 121 (1918)