The Way Ahead is a British Second World War drama released in 1944. It stars David Niven and Stanley Holloway and follows a group of civilians who are conscripted into the British Army to fight in North Africa. In the U.S., an edited version was released as The Immortal Battalion.
The film was written by Eric Ambler and Peter Ustinov and directed by Carol Reed. The three had originally produced the 1943 training film The New Lot, which was produced for the Army Kinematograph Service. The Way Ahead was an expanded remake of their earlier film, this time intended for a commercial audience. The two films featured some of the same actors, including John Laurie, Raymond Huntley and Peter Ustinov. Niven, a 1930 graduate of Sandhurst, was at the time a major in the British Army working with the Army Film Unit and later served in Normandy with GHQ Liaison Regiment.
(Summary from Wikipedia)