What number of barges were sunk in Dunkirk ?
The Royal Navy 's most significant losses in the operation were six destroyers : , sunk by on 29 May , sunk by air attack at Dunkirk on 29 May , sunk by a torpedo from the E-boat " S-30 " on 29 May , , and , sunk by air attack off the beaches on 1 June The French Navy lost three destroyers : , mined off Nieuport on 30 May , sunk by the E-boats " S-23 " and " S-26 " on 31 May " Le Foudroyant " , sunk by air attack off the beaches on 1 June