Military aircraft production was begun by the company in the 1930s and eventually monopolized all its resources. Perhaps the most notable design was the Junkers Ju 87 "Stuka" dive bomber, one of the Luftwaffe's most effective aerial weapons in the early-war period and continually used for bombing attacks as an integral part of the Blitzkrieg strategy. The Stuka was used both for precision tactical bombing and the strafing of enemy positions, acting as a sort of "airborne artillery" that was able to keep up with the fast-moving tanks and attack defended points long before traditional artillery could be brought into range. Later in the war it was fitted with two large-calibre, "Bordkanone 3,7" 37mm underwing autocannon and employed in a "tank busting" role against Soviet armour. It gained notoriety for its use at both Dunkirk and later Stalingrad, where it caused enormous destruction under Field Marshal Wolfram von Richthofen's VIII Air Corps.