First Wartime Patrol

Aug. 2, 1918. The 135th Corps Observation Squadron makes its first wartime patrol in U.S.-assembled DH-4s powered by American made Liberty engines. Although the DH-4 was originally a British combat airplane, it was redesigned in the U.S. in 1917 for the famed Liberty engine.

The airplane was used by the U.S. Air Service in France primarily for observation, day bombing, and artillery spotting.