The Bachem Ba 349 Natter was a single-use point defense interceptor. It was a desperate attempt to defend Germany against Allied bomber streams. The Natter was powered by a Walter HWK 109-509C-1 liquid rocket engine supplemented by four Schmidding SG 34 solid rockets for take-off. The Natter was constructed of wood and was designed to be disposable. Armament consisted of 33 R4M rockets in the nose. It was to be launched vertically when Allied bombers were overhead, flying into the bomber formation and launching its rockets. The pilot was then to glide clear, the aircraft separating and both the pilot and rocket engine were to return by parachute.
The first manned launch resulted in the death of the test pilot, Lothar Sieber. Subsequent manned launches were successful. Several Natter were produced. Most were expended in testing, none were used operationally.