The world's first operational jet fighter, the Me-262 Schwalbe, was powered by two Junkers Jumo 004 B turbine engines and had sleekly swept wings and a powerful armament of four 30-mm cannons. With a top speed of approximately 869.4 kph (540 mph), the 262 was 193.2 kph (120 mph) faster than the famed North American Mustang at the same altitude and, although not so maneuverable, was able to engage in, or retire from, combat at will.