In 1915, airplanes appeared over the battlefields of the First World War, which even the most daring science fiction writers of the early 20th century did not dream of. Huge four-engine bombers "Ilya Muromets," designed by the brilliant Russian aircraft designer Igor Sikorsky, terrified the enemy. Until the end of the Great War, no one else was able to create anything like this. The revolution destroyed not only old Russia, but also its nascent aircraft industry.