But politics overtook the situation because Mihailovich and the Royalists were about to be abandoned by the British government – as parts of the Chetnik movement co-operated with the Nazis – in favour of the Communist and Stalinist leader Josip Broz Tito.

Speaking in Parliament on 22 February 1944, the Prime Minister, Winston Churchill, said: "General Mihailovic, I much regret to say, drifted gradually into a position where his commanders made accommodations with Italian and German troops…" The screenplay, by John Dighton and Monja Danischewsky, was accordingly amended, and the film was re-edited.

One brother, Milosh, a Yugoslav military captain forms an anti-Nazi guerilla movement in the mountains of Serbia.

His brother, Dr. Stephan Petrovitch, poses as a Nazi collaborator to obtain information for the guerrillas while working directly under General von Staengel, commander of the German occupation force.

Using information obtained by Stephan, Milosh and his guerrillas are able to ambush a German train and free Yugoslav PoWs, while wounding General Staengel in the process.