Operation Chariot
The British used a "Kriegsmarine" ensign in the St Nazaire Raid and captured a German code book. The old destroyer "Campbeltown", which the British planned to sacrifice in the operation, was provided with cosmetic modifications that involved cutting the ship's funnels and chamfering the edges to resemble a German Type 23 torpedo boat. By this ruse the British were able to get within two miles (3 km) of the harbour before the defences responded, where the explosive-rigged "Campbeltown" and commandos successfully disabled or destroyed the key dock structures of the port.