The mine-sowing began the moment war was declared, and on 5 August the Konigin Luise was sunk in the nefarious act of sowing loose mines in the North Sea. Fixed mines for coast and harbour defence or minefields at sea are legitimate means of war, provided that warning is given of the dangerous area; loose mines are prohibited by international law, because they can make no distinction in their destruction between neutrals and belligerents, merchantmen and men-of-war. But the German flag having practically disappeared from the seas, the Germans paid little heed to the risks of other people. On 6 August a light cruiser, the Amphion, struck one of these mines and was sunk, and on 3 September a gunboat, the Speedy, met with a similar fate. A more serious loss, though only one man was killed, was that of the super-Dreadnought Audacious, which struck a mine to the north of Ireland on 27 October and sank as she was being towed into harbour; and a mine caused the loss of the Hampshire, with Lord Kitchener on board, in June 1916. The submarine proved, however, the greater danger, and there was nothing illegal in the sinking of men-of-war or transports. On 5 September the Pathfinder, a light cruiser, was torpedoed and sunk, and on the 13th the British retaliated by sinking the German light cruiser Hela near Heligoland. The warning, however, had not been taken to heart, and on 22 September the German submarine commander, Otto Weddigen, successively sank the Aboukir, the Hogue, and the Cressy, three old but substantial cruisers on patrol duty off the Dutch coast. The Hogue and the Cressy were lost because they came up to the rescue and were protected by no screen of destroyers, and 680 officers and men were drowned. A fourth cruiser, the Hawke, was torpedoed off Aberdeen on 15 October, and on 1 January 1915 the Formidable, of 15,000 tons, was sunk off Start Point on her way to the Dardanelles, with a loss of 600 of her crew. The Germans were not, however, immune in their submarine campaign. H.M.S. Birmingham rammed and sank a German submarine on 6 August, the Badger did the like on 25 October, and U18 was sunk on 23 November; Weddigen himself was rammed, with the loss of his submarine and all on board, later on by the Dreadnought.