I think the original question was pertaining to the use of air to ground ordnance in an air to air context but I have to agree with Davebender. The 55mm R4M rockets (Rakete 4kg Minenkopfwere) were originally designed as an air to air weapon system but they were certainly an unguided rocket,with a contact fuse,and they certainly shot down US bombers.
The Luftwaffe also employed the Werfergranäte 21 (Wrf.Gr. 21 ) a 210mm mortar/rocket. You may have seen pictures of aircraft with the launch tubes slung under the wings. These usually had timed fuses if I'm remembering correctly, and were intended to break up the bomber formations (boxes) making them easier to attack.
Cheers
Steve