During the Second World War, a mixture of dive bombers and fighters were used for CAS missions. Dive bombing permitted greater accuracy than level bombing runs, while the rapid altitude change made it more difficult for antiaircraft gunners to track. The Junkers Ju 87 "Stuka" is a well known example of a dive bomber built for precision bombing but which was successfully used for CAS. It was fitted with wind-blown whistles on its landing gear to enhance its psychological effect. Some variants of the Stuka were equipped with a pair of "Bordkanone" BK 3,7 cannons mounted in under-wing gun pods, each loaded with two six-round magazines of armour-piercing tungsten carbide-cored ammunition, for anti-tank operations.