One of the main duties of the Navy was to convoy transports and supplies across the Atlantic. This was done with the assistance of Allied vessels with remarkable success. For a long period it seemed as if the U-boats would not be able to penetrate through the Allied convoy, but during 1918 four transports were torpedoed. The first was the Tuscania which was sunk in February off the north coast of Ireland, with 1,912 officers and men of the Michigan and Wisconsin guardsmen, of whom 204 were lost. The Oronsa, which was torpedoed in April, contained 250 men and all were saved except three of the crew. The Moldavia came next with five hundred troops, of whom fifty-five were lost. On September 6th the troopship Persic with 2,800 American soldiers was torpedoed but American destroyers rescued all on board, and the Persic, which was prevented from sinking by its water-tight bulkheads, was afterwards beached. Several American ships, including the troop transport Mount Vernon, were torpedoed on return trips and a number of the men of their crews were lost, and several naval vessels were lost, including the destroyer Jacob Jones, and the patrol vessel Alcedo. The Cassin was torpedoed, but reached port under its own steam and later returned to service. In September and October three more American transports were added to the list of American losses. On September 26th the United States steamer Tampa was torpedoed and sank with all on board, losing 118 men. On September 30th the Ticonderoga was also torpedoed, eleven Naval officers and 102 enlisted men being lost. In addition to these submarine losses several ships and a number of men were lost through collision. The United States steamer Westgate was sunk in a collision with the steamer American on October 7th, with the loss of seven men. On October 9th the United States destroyer Shaw lost fifteen men in a collision, though she later succeeded in reaching port. On October 11th the American steamer Otranto was sunk in a collision with the British liner Cashmere. Of seven hundred American soldiers who were on board 365 were lost. At this time about three thousand anti-submarine craft were in operation day and night around the British Isles, and about five thousand working in the open sea. This was what made it possible for the Allies to win the war. Inasmuch as the illegal use of the submarine by Germany brought America into the war it was extremely appropriate that she should take an active part in the suppression of the submarine menace. The methods which were used in fighting the submarines differed much in different cases. The action of the government in arming merchantmen and in providing them with trained gun crews did much to lower the number of such ships sunk by the U-boats.