Formed in 1935, First U-Boat Flotilla operated against HitlerÕs enemies from the very earliest stage of the war through to September 1944 when disbanded amid the flames of Brest during the US siege. Over seventy-five per cent of operational U-boats were lost as the AlliesÕ counter-measures and code-breaking successes took ever greater effect. This fascinating work records the FlotillaÕs successes and disasters in detail.