Meanwhile, it didn’t seem as if the Allies could withstand the German onslaught, he continued. Pilots were tiring out from the continued flying, while the Allies lost flyers faster than they could replace them. However, the Germans switched from bombing airfields to bombing London. This allowed the Allies to regroup and, much to the surprise of the Germans, send out hundreds of new fighter planes to counter the enemy aerial armadas. 15 air battle, Hitler cancelled the planned invasion.