They Were Not Divided is a 1950 British war film, which depicted the Guards Armoured Division in Second World War Europe. It was written and directed by Terence Young, a former Guards officer who served in the campaigns depicted in the film.
The cast consisted of little known professional actors, and real soldiers with speaking parts. The male leads were Edward Underdown and Ralph Clanton.
Two supporting actors who became famous later on were Christopher Lee as a tank commander, and Desmond Llewelyn as a tank gunner.
During the middle years of the war, three men are called up to serve in the British Army. The Englishman Philip Hamilton, the American David Morgan and the Irishman Smoke O'Connor are drafted into the Guards Division and report to their barracks at Caterham, Surrey. After going through strict training (including real Coldstream Guards R.S.M., Sergeant Major Brittain) they find themselves receiving emergency promotions. Philip and David are promoted to 2nd Lieutenant and...