- John Mills as Cpl. "Tubby" Binns
- Robert Urquhart as Pvt. Mike
- Ray Jackson as Pvt. Barlow
- Meredith Edwards as Pvt. Dave Bellman
- Anthony Nicholls as Military spokesman
- Bernard Lee as Charles Foreman
- Michael Shillo as Jouvet, a French reporter
- Richard Attenborough as John Holden
- Sean Barrett as Frankie
- Victor Maddern as Merchant seaman in pub, who resents Holden's attitude
- Maxine Audley as Diana Foreman, Charles' wife
- Bud Flanagan as Himself
- Chesney Allen as Himself
- Kenneth Cope as Lt. Lumpkin
- Denys Graham as Pvt. Fraser
- Barry Foster as Despatch Rider, who directs Tubby to the artillery camp
- Warwick Ashton as Battery sergeant major in France
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- Peter Halliday as Battery major in France
- Ronald Hines as Pvt. Miles (battery crew)
- Roland Curram as Pvt. Harper (battery crew)
- John Welsh as Staff colonel
- Lloyd Lamble as Staff colonel
- Cyril Raymond as General Viscount Gort, VC
- Nicholas Hannen as Vice-Admiral Ramsey at Dover
- Eddie Byrne as Commander (Tough's Yard)
- Patricia Plunkett as Grace Holden, John's wife
- Michael Gwynn as Commander at Sheerness
- Michael Bates as Froome
- Christopher Rhodes as Sergeant on the beaches
- Lionel Jeffries as Medical colonel
- Harry Landis as Dr. Levy, a military doctor working on the beach
- John Horsley as Padre
- Patrick Allen as Sergeant on parade ground
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