Dambusters - The History of the Bouncing Bomb

Taking off in three groups after dark on May 17, Gibson's crews flew at around 100 feet to evade German radar. On the outbound flight, Gibson's Formation 1, consisting of nine Lancasters, lost an aircraft en route to the Möhne when it was downed by high tension wires. Formation 2 lost all but one of its bombers as it flew towards Sorpe. The last group, Formation 3, served as a reserve force and diverted three aircraft to Sorpe to make up for losses. Arriving at Möhne, Gibson led the attack in and successfully released his bomb.

He was followed by Flight Lieutenant John Hopgood whose bomber was caught in the blast from its bomb and crashed. To support his pilots, Gibson circled back to draw German flak while the others attacked. Following a successful run by Flight Lieutenant Harold Martin, Squadron Leader Henry Young was able to breach the dam.

With the Möhne Dam broken, Gibson led the flight to Eder where his three remaining aircraft negotiated tricky terrain to score hits on the dam. The dam was finally opened by Pilot Officer Leslie Knight.

While Formation 1 was achieving success, Formation 2 and its reinforcements continued to struggle. Unlike Möhne and Eder, the Sorpe Dam was earthen rather than masonry. Due to increasing fog and as the dam was undefended, Flight Lieutenant Joseph McCarthy from Formation 2 was able to make ten runs before releasing his bomb. Scoring a hit, the bomb only damaged the crest of the dam. Two aircraft from Formation 3 attacked as well, but were unable to inflict substancial damage. The remaining two reserve aircraft were directed to secondary targets at Ennepe and Lister. While Ennepe was unsuccessfully attacked (this aircraft may have struck Bever Dam by mistake), Lister escaped unharmed as Pilot Officer Warner Ottley was downed en route. Two additional aircraft were lost during the return flight.

AFTERMATH
Operation Chastise cost 617 Squadron eight aircraft as well as 53 killed and 3 captured. The successful attacks on the Möhne and Eder dams released 330 million tons of water into the western Ruhr, reducing water production by 75% and flooding large amounts of farmland. In addition, over 1,600 were killed though many of these were forced laborers from occupied countries and Soviet prisoners of war. While British planners were pleased with the results, they were not long lasting. By late June, German engineers had fully restored water production and hydroelectric power. Though the military benefit was fleeting, the success of the raids provided a boost to British morale and aided Prime Minister Winston Churchill in negotiations with the United States and Soviet Union.

For his role in the mission, Gibson was awarded the Victoria Cross while the men of 617 Squadron received a combined five Distinguished Service Orders, ten Distinguished Flying Crosses and four bars, twelve Distinguished Flying Medals, and two Conspicuous Gallantry Medals.
https://www.thoughtco.com/operation-chastise-the-dambuster-raids-2360533
https://en.wikipedia.org/wiki/Operation_Chastise

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