When Churchill said ...we shall never surrender, he really meant it.
One of the relevant bits:
The men recruited for operational duties were selected chiefly for their knowledge of the local terrain – farmers, poachers and gamekeepers among them. Having signed the Official Secrets Act, they received intensive training in guerrilla-warfare techniques, including unarmed combat, sabotage and demolition, on weekend courses at Coleshill House, the Auxiliary Units’ HQ near Swindon.
Gee, local citizens who were already familiar with arms and moving through the woods...