 It was used to disable the V2 factory, bury the V3 guns, sink the battleship "Tirpitz" and damage the U-boats' protective pens at St. Nazaire, as well as to attack many other targets which had been impossible to damage before.One of the most spectacular attacks was shortly after D-Day, when the Tallboy was used to prevent German tank reinforcements from moving by train.Rather than blow up the tracks – which would have been repaired in a day or so – the bombs were targeted on a tunnel near Saumur which carried the line under a mountain.