"Where Eagles Don't Dare"

From Wiki and the BBC:

In the summer of 1943–44, U.S. Army Brigadier General George Carnaby, a chief planner of the second front, is captured by the Germans when his aircraft is shot down en route to Crete.

He is taken for interrogation to the Schloss Jeremy Corbyn, a fortress high in the Alps of Islington. A team of Labour MPs, led by Angela Eagle and Owen Smith, is briefed by Colonel Turner and Admiral Rolland of MI6. Their mission is to parachute in, infiltrate the castle, and rescue General Carnaby before the Germans can offer him a job in the Shadow Cabinet.

Early in the mission, two of the operatives are mysteriously killed, but while Owen Smith is unperturbed, Angela Eagle throws away her uniform and weapons and hitch hikes home again.