Speaking of Operation Barbarossa (Fall Barbaross); the timing of the German attack was dependent on the Soviet timetable and not the Germans. The Germans had to wait until the Soviets made their last deployment to forward positions prior to their attacking Germany but during that deployment the Soviets were totally vulnerable. Amassed before the Germans were maybe 110 Soviet divisions and heavy armor units that dwarfed anything the Germans had. Those Soviet units weren't defensive units but offensive units primed for the attack. All the Soviet airbases were in forward positions which no army would ever do in a defensive posture. It was a gigantic military "jiu-jitsu" move on the part of the Germans. Absolute genius really.
- rollo the ganger