I don't know how familiar many of you are but the 1943 Ruhr dams raid was one of the most remarkable stories of WW2. An excellent movie was made about it in the 50's.
617 was a special squadron made up of some of the best crews from all the Empire countries specially for this raid. It was kept intact and conducted many specialist raids using Barnes Wallace's special bombs for the rest of the war, including sinking the Tirpitz, sister ship of Bismark.
http://www.bbc.com/news/world-us-canada-43815109
Barnes Wallis was a creative man. Who'd a thunk of bouncing bombs over nets into a dam.