National Geographic : 1940 Dec
AP Photograph from Pictures, Inc. A Duel to the Death in the Sub-stratosphere-Fog Trails Behind Fighters Show How They Twist and Turn inCombat This grim "skywriting" reveals breath-taking maneuvers of British and German planes during a "dogfight" over the Kent coast, August 28, 1940. Sohigh arethefighters that they are mere specks in the sky. A barrage balloon floats in the sky at the left. Exact cause of such vapor trails frequently observed inthis war isuncertain.