RAF Lancaster bomber squadron breached German Ruhr dams with bouncing bomb

*English subtitle is available ▣ Bouncing bomb (Upkeep) : British engineer Barns Wallice developed this bomber ▣ Operation Chastise : RAF's operation, which bombarded the Ruhr dams which supplied water and electricity to the vital area of the German military industry. The mission was carried out by No. 617 Squadron ▣ Dambusters : No. 617 Squadron was called Dambusters after succeeding in Operation Chastise ▣Avro Lancaster : British second world war heavy bomber with four engines and used by Royal Air Force(RAF)