Winston Churchill held many important political positions over his career, including serving two non-consecutive terms as Prime Minister of the United Kingdom from 1940 to 1945 and 1951 to 1955. He played a crucial role in leading Britain during World War II and developing the allied strategy for defeating Germany. Churchill also had a military career, helping establish the Royal Naval Air Service and holding positions within the British army and ministry of munitions during World War I. He was a prolific writer and author of over forty titles.