This definitive history of the Pathfinders and the role they played in World War Two takes an in-depth look at the elite unit, from its initial inception, and less than spectacular start, to its development as a precision instrument that transformed bomber operations. The aircraft, technology and weapons used are covered in full, as are the characters involved with the unit. The author also details the training and techniques deployed, in particular the emergence of the Master Bomber and Long-Stop systems. Finally, the Pathfinder Force's contribution to victory is assessed. This comprehensive look at one of the war's most fascinating units will give the reader a greater understanding of the unit's vital contribution to the war and show how some of the techniques developed are still in use today.