On May 16, 1943, nineteen Lancaster bombers with 133 airmen took off on a night sortie code-named Operation Chastise. Hand-picked and specially trained, the Lancaster crews flew at treetop level to the industrial heartland of the Third Reich and their targets—the Ruhr River dams—whose massive water reservoirs powered Nazi Germany’s military-industrial complex. Each Lancaster carried an explosive, which when released just sixty feet over the reservoirs, bounced like a skipping stone to the dam, sank, and exploded. The raiders breached two dams and damaged a third. The resulting torrent devastated enemy power plants, factories, and infrastructure a hundred miles downstream.

Every one of the 133 airmen on the raid understood that the odds of survival were low. Of the nineteen bombers outbound, eight did not return. Operation Chastise cost the lives of fifty-three airmen, including fourteen Canadians. Of the sixteen RCAF men who survived, seven received military decorations.

Based on interviews, personal accounts, flight logs, maps, and photographs of the Canadians involved, Dam Busters recounts the dramatic story of these young Commonwealth bomber crews tasked with a high-risk mission against an enemy prepared to defend the Fatherland to the death.