After Dunkirk the British Army was broken the country isolated & invasion imminent. German Military Intelligence was sat the task of recruiting collaborators from among Welsh nationalists to sabotage military & civilian installations ahead of the landing. Strategic deception was one of the few weapons left. To fool the Germans into believing Britain was ready & able to repel invaders when in fact it had only the weapons salvaged from Dunkirk MI5 invented an imaginary cell of Welsh saboteurs led by a retired police inspector.