The daring attack on the Ruhr dams in May 1943 by RAF Lancasters of 617 Squadron remains one of the greatest feats of arms of the 20th century. It had all the ingredients of a classic adventure story - a miracle weapon designed to destroy an indestructible target in a raid carried out by an elite bomber squadron led by a highly decorated young wing commander. This lavishly illustrated account tells the full story, including a chapter on the epic 1954 film The Dam Busters, and fully detailed appendices.