Forester moved to the United States during the Second World War, where he worked for the British Ministry of Information and wrote propaganda to encourage the US to join the Allies. He eventually settled in Berkeley, California. He met Roald Dahl in 1942 while living in Washington, D.C., and Forester encouraged him to write about his experiences in the RAF. According to Dahl's autobiography Lucky Break, Forester asked him about his experiences as a fighter pilot, and this prompted Dahl to write his first story "A Piece of Cake".