The exact drawings of the V-2 rocket, the production of the Tiger tank and others could be passed on via Maier's relationship with the Vienna city commander Heinrich Stümpfl. As a result, precise location sketches and production figures for steel mills, weapon, ball bearing and aircraft factories soon reached Allied general staffs. Via Walter Caldonazzi there were contacts to the Heinkel factories in Jenbach, where drive components for the Messerschmitt Me 163 Komet and V-2 rockets were manufactured. In some cases, Maier had received information from front-line soldiers on leave about the industrial facilities. American and British bombers were able to strike armaments factories such as the secret V-rocket factory in Peenemünde and the Messerschmitt plants near Vienna. These contributions by the resistance group via the defense industry and production sites (Operation Crossbow, Operation Hydra) were later to prove to be 92 percent correct and were thus an effective contribution to Allied warfare. On the one hand, the Allies were able to target the arms industry and on the other hand, this information and the subsequent air strikes decisively weakened the supply of the German Air Force.