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The Commander Lieutenant throws the platoon in at the deep end with a week-long exercise in the Brecon Beacon mountains where the Riflemen undergo a competition scrutinising their fitness and mental resilience.

After the PM says Britain is ready to deploy a peacekeeping force within weeks, 13 Platoon's schedule intensifies with urban warfare and nocturnal training exercises.

Nearing the end of training, 13 Platoon faces two of the biggest tests: a large-scale battle simulation, and an endurance competition, carrying 30kilos of kit over 45 inhospitable km.