In June 1940, the UK stands as the largest country fighting the Axis powers. France has just been defeated and is now occupied, while those who fought Germany but who are trapped behind Axis lines try to make their way to safer ground in the UK. This is the case with Jan Zumbach, a Polish fighter pilot who was in France and had to evacuate after the German takeover. He makes it to Britain only to find discrimination and Royal Airforce officers who have their own prejudices against him and other Polish pilots who escaped. The Poles were relatively easily defeated by the Germans, but it was not for the lack of skill of their pilots but mostly due to their fighter aircraft not being as sophisticated as the German fighters. The Poles fought in France as well and this gave them valuable skills, which was lacking in the Royal Airforce in 1940. During the Summer of 1940, there was a fear that Britain would soon run out of pilots due to attrition. Soon, the Royal Airforce had to activate volunteers and other foreigners in Britain, including Canadians and some Americans, to fight for their side.
One of the first units created was 303 Squadron, an all-Polish unit commanded by a Canadian John Kent. Although the British are in desperate need of experienced fighter pilots, it took time before the unit was fully activated. In fact, the first enemy fighter they shot down was during an exercise in which they observed enemy bombers and fighters and Jan decided to disobey his commanders and engage the enemy. Although criticized for his actions, his knowledge of the enemy and that of his comrades soon enables them to develop better fighting techniques and after their activation they begin to score major victories mostly in southern England. They lose some of their best fighters along the way and they continue to face prejudice in the UK, but they also begin to gain respect among their commanding officers and the wider British public as they are commended for their actions during the Battle of Britain.