- Fionn Whitehead as Tommy
- Tom Glynn-Carney as Peter Dawson
- Jack Lowden as Collins (Fortis 2)
- Harry Styles as Alex
- Aneurin Barnard as Gibson
- James D'Arcy as Colonel Winnant
- Barry Keoghan as George Mills
- Kenneth Branagh as Commander Bolton
- Cillian Murphy as Shivering Soldier
- Mark Rylance as Mr Dawson
- Tom Hardy as Farrier (Fortis 1)
- Michael Caine as Fortis Leader (voice)
- Elliott Tittensor as Highlander 2
- Will Attenborough as Second Lieutenant
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