Webb was commissioned an army officer in June 1942 and became a personal aide to General Lloyd R. Fredendall who was commander of the II Corps.
Webb accompanied Fredendall to England in October 1942 and participated in the invasion of North Africa in November 1942 when the Second Corps captured the city of Oran.
In February 1943 the German army launched a counterattack at Kasserine Pass which repulsed the Second Corps and nearly broke through the Allied lines.
[4] Webb signed a contract for Warner Bros for whom he wrote the Westerns Montana (1950) with Errol Flynn, Raton Pass (1951), and The Big Trees (1952) with Kirk Douglas.
[5] He also wrote Close to My Heart (1951) based on his own novel, Operation Secret (1952), The Iron Mistress (1952) for Alan Ladd, The Charge at Feather River (1953) a 3-D film, and Phantom of the Rue Morgue (1954).
[8] He did some historical epics: Alfred the Great (1969), for MGM; Sinful Davey (1969) for John Huston and the Mirisches; and The Hawaiians (1970), for the Mirsches.