High Quality Content by WIKIPEDIA articles! The finest development in naval tugboats up to that time, Ontario served as part of the Atlantic Fleet for the first five years following commissioning. The ship operated all along the Atlantic Coast and in the Caribbean in support of Fleet exercises and did auxiliary work in various ports and naval stations. When the United States entered World War I in April 1917, the tugboat steamed along the East Coast laying anti-submarine nets and patrolling against minefields from Portsmouth, Virginia, to Portsmouth, New Hampshire and towed barges of essential war supplies to New England ports. From 24 December 1917 to 2 January 1918, Ontario helped rescue grounded freighter Matanzas, an ammunition filled merchantman in danger of breaking up off Halifax, Nova Scotia and then returned to towing and netlaying duties.

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