One of the effects of the sinking of the _Lusitania_ was to cut down the number of passengers sailing to and from America to Europe on ships flying flags of belligerent nations. Attacks by submarines on neutral ships did not abate, however, for on the 15th of May, 1915, the Danish steamer _Martha_ was torpedoed in broad daylight and in view of crowds ashore off the coast of Aberdeen Bay. The sinking of ships in the "war zone" continued in spite of rumors that the German admiralty was expected to discontinue operations of the submarines against merchantmen on account of the unfriendly feeling aroused in neutral nations, particularly the United States. On the 19th of May, 1915, came the news that the British steamship _Dumcree_ had been torpedoed off a point in the English Channel. A torpedo fired into her hull failed to sink her immediately, and a Norwegian ship came to her aid, passing her a cable and attempting to tow her to port. But the submarine returned, and fearing attack, the Norwegian ship made off. A second torpedo fired at the _Dumcree_ had better effect than the first one, and she began to settle. When the submarine left the scene the Norwegian steamship again returned to the _Dumcree_ and managed to take off all of her crew and passengers. Three trawlers, one of them French, were sunk in the same neighborhood during the next forty-eight hours. As soon as Italy entered the war an attempt was made by the Teutonic Powers to establish the same sort of submarine blockade in the Adriatic which obtained in the waters around Great Britain. This was evinced when the captain of the Italian steamship _Marsala_ reported on May 21, 1915, that his ship had been stopped by an Austrian submarine, but the latter not wishing to disclose its location to the Italian navy, allowed his ship to proceed unharmed. The suspicion that the German admiralty maintained bases for their submarines right on the coasts of Great Britain where the submersible craft could obtain oil for driving their engines, as well as supplies of compressed air and of food for the crew, was confirmed on the 14th of May, 1915, when it was reported that agents of the British admiralty had discovered caches of the kind at various points in the Orkney Islands, in the Bay of Biscay, and on the north and west coasts of Ireland. In order to damage shipping in the "war zone" by having ships go wrong through having no guiding lights an attack was made by a German submarine on the lighthouse at Fastnet, on the southern coast of Ireland, on the night of May 25, 1915. Shortly after nine in the evening the submarine was sighted in the waters near the lighthouse by persons on shore. She was about ten miles from Fastnet, near Barley Cove. When she came near enough to the lighthouse to use her deck guns, men on shore opened fire on her with rifles, and she submerged, not to reappear in that neighborhood again.