Arthur Tedder, who was knighted and raised to the peerage for his contributions to the Allied victory in World War II, served in the British air force in World War I and played an important role in professionalising and organising British air forces between the two world wars. During World War II he held a succession of increasingly vital air force posts.In addition to his achievements as Air Commander-in-Chief in the North African theatre early in the war, Tedder’s most lasting contribution was as Deputy Supreme Commander under Dwight D. Eisenhower. He deserves much credit for keeping the Allied command functioning and harmonious. He was also the architect of the successful air strategy Eisenhower adopted for the Normandy invasion of 1944, which departed from both the British and American existing doctrine and models by concentrating on German rail systems rather than on either civilian or industrial targets.