High Quality Content by WIKIPEDIA articles! The Ruhrstahl X-4 was a wire guided air-to-air missile designed by Germany during World War II. The X-4 did not see operational service and thus was not proven in combat. The X-4 was the basis for the development of experimental, ground launched anti-tank missiles that became the basis for considerable post-war work around the world, including the Malkara missile. During 1943, the USAAF's Eighth Air Force mounted a series of heavy raids against Germany. Despite disastrous bomber losses, these prompted Luftwaffe research into considerably more powerful anti-bomber weaponry in order to reduce the cost in lost fighter aircraft and aircrew. A massive development effort resulted in a number of heavy-calibre 30mm to 75mm autocannon designs, air-to-air rockets, SAMs and the X-4.

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