In this image the spitfire plane is trying to flip the V1 rocket, which is heading to bomb London. By flipping the V1 rocket, the gyroscope will become off balance and thus cause it to go off the target.
Spitfire Flipping V1 Rocket

Here is the actual historic image of this happening.
Historic Image: V1 getting flipped by a Spitfire

Edit:

Here is a historic picture which shows what happened step by step.
Historic Image: V1 getting flipped by a Spitfire- Step by Step