In this British poster by an unknown artist, British and German airplanes duel in the sky—with the “Beastly Hun” getting the worst of it. The aircraft seem to have been copied from an earlier poster—the state of the art had advanced considerably by the time the Royal Flying Corps and Royal Naval Air Service were amalgamated into the Royal Air Force on April 1, 1918. (GHI/Universal History Archive via Getty Images)
GHI/Universal History Archive via Getty Images