The Lancaster bomber shuddered as it dropped to sixty feet above the reservoir, so low that spray from the water licked its belly.

The Dambusters Strike: Operation Chastise and the Drowning of the Ruhr

When Bouncing Bombs Broke Hitler's Industrial Heart

In 1943, British bombers armed with bouncing bombs breached Germany's crucial dams in one of WWII's most daring raids.

The Lancaster bomber shuddered as it dropped to sixty feet above the Möhne reservoir, so low that spray from the water licked its belly. Flight Lieutenant John Hopgood could see the anti-aircraft tracers arcing toward him like angry fireflies. It was 00:32 on May 17, 1943, and 617 Squadron was attempting the impossible.

The plan was audacious to the point of madness. Barnes Wallis, a brilliant engineer who had designed airships before the war, had conceived a weapon that defied physics: a cylindrical bomb that would skip across water like a stone, hop over torpedo nets, and detonate against dam walls. The Air Ministry had dismissed him as a crank until tests proved the "bouncing bomb" worked.

Nineteen Lancaster bombers, specially modified to carry the 9,250-pound "Upkeep" bombs, had lifted off from RAF Scampton that night. Their targets: the Möhne, Eder, and Sorpe dams, whose reservoirs supplied water and hydroelectric power to the Ruhr Valley's war factories. Destroying them could cripple German steel production.

The crews flew at treetop level across occupied Europe, navigating by moonlight reflected off rivers and canals. German flak claimed aircraft before they even reached…

💡 The crews practiced for weeks at English reservoirs, flying so low that one Lancaster returned with tree branches lodged in its fuselage.