Fionn Whitehead Tommy Tom Hardy Farrier Mark Rylance Mr. Dawson Kenneth Branagh Commander Bolton Cillian Murphy Shivering Soldier Barry Keoghan George Harry Styles Alex Aneurin Barnard Gibson Tom Glynn-Carney Peter Jack Lowden Collins Damien Bonnard French Soldier Lee Armstrong Grenadier James Bloor Irate Soldier Luke Thompson Warrant Officer Michel Biel French Soldier 2 Constantin Balsan French Soldier 3 Billy Howle Petty Officer Mikey Collins Soldier Callum Blake Stretcher Bearer Dean Ridge Soldier at the Gap Bobby Lockwood Able Seaman Will Attenborough Second Lieutenant Tom Nolan Lieutenant James D'Arcy Colonel Winnant Matthew Marsh Rear Admiral