At the beginning of the war there were 361 vessels ready for service, including twelve first-line battleships, twenty-five second-line battleships, nine armored cruisers, twenty-four other cruisers, seven monitors, fifty destroyers, sixteen coast torpedo vessels, seventeen torpedo boats, forty-four submarines, eight tenders to torpedo boats, twenty-eight gunboats, four transports, four supply ships, one hospital ship, twenty-one fuel ships, fourteen converted yachts, forty-nine tugs, and twenty-eight minor vessels. There were about seventy thousand regularly enlisted men, besides eight thousand five hundred members of the naval militia. Many yachts together with their volunteer crews had been offered to the government by patriotic citizens. For the complete mobilization of the Navy, as it then stood, 99,809 regularly enlisted men and 45,870 reserves were necessary. About twenty-seven thousand of these were needed for coast defense, and twelve thousand at the various shore stations. Retired officers were called out, and assigned to duty which would permit officers on the active list to be employed in sea duty. The Navy therefore still lacked thirty-five thousand men to bring it up to its full authorized strength at the beginning, but after the declaration of war an active recruiting campaign brought volunteers by thousands. The service was a popular one and recruits were easily obtained. One of the first phases of the mobilization was the organization of a large fleet of mosquito craft to patrol the Atlantic Coast, and keep on the watch for submarines. Many of these boats had been private yachts, and hundreds of young men volunteered from the colleges and schools of the country for this work. Many boat builders submitted proposals to construct small boats for this kind of patrol duty, and on March 31st a coast patrol fleet was organized by the Government under the command of Captain Henry B. Wilson. [Illustration: MAP OF THE UNITED STATES SHOWING THE IMMENSE LENGTH OF COAST-LINE TO BE DEFENDED] The Navy took possession immediately on the declaration of war of all wireless stations in the United States dismantling all that could not be useful to the Government. War zones were established along the whole coast-line of the United States, making a series of local barred zones extending from the larger harbors in American waters all along the line. These harbors were barred at night to entering vessels in order to guard against surprise by German submarines. Contracts were awarded for the construction of twenty-four destroyers even before war was declared, and many more were already under construction. [Illustration: © _Underwood and Underwood, N. Y._ A “SMOKE CURTAIN” VIEWED FROM BEHIND THE SCENES The U. S. battleship Wyoming pours out from her funnels the heavy opaque smoke screen which is designed to lie low on the water and prevent observation by the enemy.]