"Operation Chastise" The night they breached the Dam! Led by Guy Gibson nineteen  Lancasters of 617 squadron attacked Ruhr Valley Dams. The attack used an innovative " Bouncing Bomb" developed by Barnes Wallis. The 10,000lb bouncing bomb was released at precisely 60' and bounced on the water towards the dams rolled down the dam wall and exploded. 

The raid was a great success and a terrific moral builder for the British public. Of the nineteen Lancaster's that joined the raid eight would not return with a loss of 54 crew members.

The "Aircrew" is signed by George Chalmers, Edward Johnson, Ray Grayston, Dudley Neal and George Johnson six pilots and crew who flew in the raid.