Friend or Foe Friendly Fire at Sea, 1939–1945

During the Second World War, there were over 100 instances of naval engagements between ships, submarines and aircraft of the same side. In the past there has often been a reluctance by the authorities to admit to these losses but with operational records now available, it is possible for historians to explain how a good number of ships and submarines were attacked, damaged or sunk by the forces of their own side.