She was the first skipjack built on the Western Shore of the Chesapeake in The boat is equipped with an inboard engine for use in restricted waters and. There were four types of coastal defence craft during. World War II: • Motor Torpedo Boats (MTBs),. • Motor Gun Boats (MGBs). Motor Torpedo Boat (MTB) built in Portsmouth for the Royal Norwegian Navy, but commandeered by Britain on the outbreak of war. She saw.