Barrie William Edward Pitt was educated at Portsmouth Southern Grammar School before becoming a bank clerk. After service in the Second World War Pitt worked as a surveyor, joined 21 SAS (TA), with whom he rose to the rank of sergeant, and started to write for the magazine Adventure. Pitt also worked for a time as an information officer at the Atomic Energy Authority establishment at Aldermaston, where he demonstrated a talent for turning scientific information into readable prose In 1958, Pitt wrote a novel, The Edge of Battle, and Zeebrugge, an admired account of the First World War raid on the Belgian U-boat base. This led to a long and prolific career as an author and editor of popular histories. Under the overall editorship of Sir Basil Liddell-Hart, he was responsible for the first major part-work, Purnell's History of the Second World War, a 96-instalment mass circulation series which was launched in 1966 at the Imperial War Museum. He also worked as a researcher for the 1960s BBC television series The Great War.