The key to the success of "three-headed dog" lies in the suddenness of action. In order to keep it strictly confidential, the Germans made a plan to bully the enemy. They first spread the news that Brest's fleet sailed for the Atlantic Ocean and even the Pacific Ocean. German radio kept sending false telegrams, and Siriax deliberately ordered a large number of tropical military uniforms and low-latitude sunglasses in Paris. The German Air Force also made a lot of preparations for air support, dividing the whole route into three sections, and all the 2nd and 26th air brigades were put into operation. All airports are equipped with corresponding ground personnel and facilities to ensure that the aircraft can refuel and hang bombs within half an hour after landing.