The old 102 torpedo boats. The plyed their trade (of death) around the English Channel sinking many enemy vessels. Their speed allowed them to go out at night and up close to the vessels discharging their deadly cargo in range and turning fast for home. these craft were often skippered by junior officers and seen as expendable. The tubes mounted on the deck (one each side) contained the compressed air driven Torpedoes. A story related to me by and ex torpedo boat shipper was that as they turned for home the fog came in and the only way that they could get back into their respective port was to follow the contour lines of the bottom of the Channel until they found a break( irregularity in the bottom) and then turn up into the relevant river/harbour. One has to remember that they had no Radar which we mariners take for granted today