Jeschonnek involved himself in Balkans Campaign—the German invasion of Yugoslavia and the invasion of Greece. Jeschonnek supported the use of paratrooper forces in the Battle of Crete and Kurt Student's desire to use Crete as a staging post for invasions of Cyprus and Suez canal regions. Jeschonnek flew to Athens to oversee the Crete invasion. In the midst of the battle, he received news the "Bismarck" had sunk. He sent an Enigma machine message, intercepted by ULTRA, enquiring into the whereabouts of his staff's son, a midshipman, on board.