Final answer:
The Battle of Britain was Hitler's first major defeat of WWII and demonstrated the importance of airpower in modern warfare. Winston Churchill's leadership united Britain and prevented a potential invasion.
Step-by-step explanation:
The Battle of Britain was Hitler's first major defeat of WWII. Although technically a draw, the battle demonstrated the importance of airpower in modern warfare and the resilience of the British forces. British Prime Minister Winston Churchill united the country and convinced the leaders to reject Hitler's truce, preventing a potential invasion of Britain.