A disparate group of volunteers are trained as saboteurs and parachuted into Belgium to blow up an office containing important Nazi records and to rescue a prominent S.O.E. agent, who is being interrogated by the Germans for vital information.

Based on real events, this historical drama is set in 19th-century Ireland, when poverty-stricken tenants dispossessed by greedy landowner Capt. Boycott (Cecil Parker) band together to assert their rights. Patriotic farmer Hugh Davin (Stewart Granger) leads the rebels. Choosing nonviolent resistance, the villagers ostracize their nemesis, who squanders his fortune to repair his ruined reputation and wagers what's left on a horse race.