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The third USS ''Vigilant'' (SP-406), later USS ''SP-406'', was a United States Navy patrol vessel in commission from 1917 to 1918. ''Vigilant'' was built as the private motorboat ''Marguerite II'' in 1909 by Henry L. Blatz at Philadelphia, Pennsylvania. She had been renamed ''Vigilant'' by the time the U.S. Navy acquired her from her owner, E. B. Smith of Philadelphia, in 1917 for use as a section patrol vessel during World War I. She was commissioned as USS ''Vigilant'' (SP-406) on 19 May 1917 at the Philadelphia Navy Yard with Ensign John B. Yarnall, USNRF, in command. On 28 May 1917, ''Vigilant'' proceeded from Philadelphia to Essington, Pennsylvania, for installation of her armament. She loaded ammunition at Fort Mifflin on 5 June 1917, then reported to the 4th Naval District for duty on 7 June 1917. For the remainder of World War I, ''Vigilant'' patrolled the Delaware Bay and the Atlantic coast of the United States from Atlantic City, New Jersey, to the mouth of the Chesapeake Bay. She also carried messages, men, and mail to ships and stations within the 4th Naval District. Occasionally, she ventured out to sea to search for survivors of torpedoed merchant ships, as she did on 9 June 1918 after a German submarine had sunk SS ''Del Rio''. In 1918, ''Vigilant'' was renamed USS ''SP-406'', apparently to avoid confusion with the tug , which was in commission at the same time. After World War I ended on 11 November 1918 and defensive patrols were suspended on 24 November, ''SP-406'' proceeded to Philadelphia early in December 1918 for inactivation. She was decommissioned there on 24 December 1918 and was returned to her owner. ==References== * *(NavSource Online: Section Patrol Craft Photo Archive: Vigilant (SP 406) ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「USS Vigilant (SP-406)」の詳細全文を読む スポンサード リンク
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