First published in 1980, then renamed in 1982, this is the story of two men of the Army Dental Corps. Both had applied to join combat units but were turned down. They then formulated their own military and fitness training, stole weapons, ammunition, documents and a boat and invaded France. There they carried out acts of sabotage and were then hunted by Nazi troops. They were fired out and almost died on their return journey back to England. Subsequently they were disciplined but were allowed to join combat units. A very interesting book and I read it within a day.