- George MacKay as Lance Corporal William "Will" Schofield
- Dean-Charles Chapman as Lance Corporal Thomas "Tom" Blake
- Mark Strong as Captain Smith
- Andrew Scott as Lieutenant Leslie
- Richard Madden as Lieutenant Joseph Blake
- Claire Duburcq as Lauri
- Colin Firth as General Erinmore
- Benedict Cumberbatch as Colonel Mackenzie
- Daniel Mays as Sergeant Sanders
- Adrian Scarborough as Major Hepburn
- Jamie Parker as Lieutenant Richards
- Pip Carter as Lieutenant Gordon
- Michael Jibson as Lieutenant Hutton
- Richard McCabe as Colonel Collins
- Justin Edwards as Captain Ivins
- Nabhaan Rizwan as Sepoy Jondalar
- Billy Postlethwaite as PCO Harvey
- Gerran Howell as Private Parry
- John Hollingsworth as Sergeant Guthrie
- Jack Shalloo as Private Seymour
- Paul Tinto as NCO Baker
- Anson Boon as Private Cook
- Tommy French as Private Butler
- Gabriel Akuwudike as Private Buchanan
- Kenny Fullwood as Private Rossi
- Spike Leighton as Private Kilgour
- Elliot Edusah as Private Grey
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