Acquired originally for section patrol duty, Rehoboth was designated for distant service in June 1917, and on 14 August 1917 headed for Boston, Massachusetts. At the end of August 1917, she continued on across the Atlantic Ocean. Steaming via the Azores, she reached Brest, France on 18 September 1917 and began operations as a unit of Division 12, Patrol Force.
On 4 October 1917, while Rehoboth was on escort duty, her hull began to leak. Her crew — unable to control the flooding — was taken off, and she was sunk by the Britishlight cruiserHMS Castor.