It is August 31, 1940. For several weeks now, an air battle between Great Britain and the Third Reich has been in progress. This period will go down in history as the Battle of Britain. A message arrives at the operations room of the 11 Fighter Group command that numerous formations of German aircraft are flying in the direction of the capital. Yesterday, a Polish 303 Squadron pilot out on a training flight shot down a German bomber. Consequently, the RAF command, which has practically no more reserves, has decided to send this Polish unit into combat. Eager to fight, the pilots have been waiting impatiently for this order. Right now they are heading for a confrontation with the German air force. At last they have an opportunity to encounter the Luftwaffe on an equal footing and avenge the defeat suffered by Poland a year ago.