The British Prime Minister during World War II known for his speeches and leadership was Winston Churchill. Serving from 1940 to 1945, Churchill is renowned for his resilience and rhetorical prowess, which inspired the British public during the darkest days of the war. His speeches emphasized determination and courage, famously encapsulated in phrases like "We shall fight on the beaches." Churchill's leadership helped galvanize Allied forces against the Axis powers, and he played a significant role at pivotal conferences with leaders like Franklin D. Roosevelt and Joseph Stalin.