USS Sussex (SP-685) was originally a commercial fishing steamer built in 1913 by R. T. Potter in Milton, Delaware. As a fishing vessel, she was constructed to serve the fishing industry, but during World War I, she was repurposed for naval service. The U.S. Navy acquired her on 5 May 1917 from the Delaware Fish Oil Co. of Lewes, Delaware, and she was commissioned shortly thereafter on 31 May 1917. The vessel was designated as SP-685, indicating her role as a section patrol craft during the war. Sussex was adapted for military use primarily as a minesweeper, tasked with clearing naval mines along the U.S. East Coast. Her operational area was within the Third Naval District, where she served throughout the duration of World War I, contributing to the safety of maritime traffic along the U.S. eastern seaboard during a critical period of naval conflict. Her service extended a few months beyond the end of the war, which concluded with the Armistice in November 1918. Sussex's specifications are not detailed in the provided source, but her construction as a fishing steamer suggests a vessel of moderate size, built for durability and maneuverability suitable for minesweeping duties. After completing her wartime service, she was struck from the Navy list on 11 March 1919, marking the end of her military career. Subsequently, she was sold on 16 January 1920, returning to civilian use or being scrapped. As the first vessel to bear the name Sussex in the U.S. Navy, her service highlights the common practice of repurposing commercial vessels for wartime needs, particularly during World War I, and underscores her role in maintaining the safety of maritime operations along the U.S. East Coast during a critical period.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.