In the UK, a squad of agents is selected and trained before parachuting into Czechoslovakia. The team operates in Prague and plans the attack for about six months. The mission, Operation Anthropoid, is executed in the capital on May 27, 1942 in an ambush. It almost fails when one of their Sten guns jams, but Heydrich is severely wounded by a grenade. Heydrich eventually succumbs to his wounds and during the frenzied aftermath the German high command takes savage reprisals, including the massacre of 340 men, women and children of Lidice and the razing of the village. The group is eventually betrayed by one of its members and they are cornered in a church crypt in Prague. In the gun-battle that follows all agents commit suicide.