イリヤー・ムーロメツ
When WWI broke out, only two Ilya Muromets bombers were completed out of an initial production run of ten aircraft. In August 1914, the Ilya Muromets was introduced to the Imperial Russian Air Service and on 10 December 1914, the Russians formed their first ten-bomber squadron, slowly increasing the number to 20 by mid-1916. Operations with the heavy bombers began on 12 February 1915 with a raid on German frontline positions.