 Pedzisa mutsara unotevera: Mukati maJuly 1943, nhamba huru dzeLancasters dzakabatanidzwa mukurwisa kwakaparadza kwamasikati ose paguta reHamburg mukati meAir Chief Marshal HarrisBasa raGomora. Basa rakakurumbira zvikuru rakaitwa neLancaster raiva basa rakabhururuka 16-17 May 1943, rakanyorwa kuti Operation Chastise, kuparadza madhamu eRuhr Valley. Basa racho rakaitwa ne617 Squadron mumotokari dzakagadziridzwa Mk IIIs dzakatakura mabhomba akasarudzika akaumbwa sedhiramu, ayo akanga agadzirwa neinjiniya weBritish Barnes Wallis. Nhau yebasa racho gare gare yakaitwa mufirimu, The Dam Busters. 