[1] Eider sailed out of Philadelphia, Pennsylvania, for minesweeping operations in the Delaware River approaches until 8 March 1919, then put into Norfolk, Virginia, to prepare for distant service.

On 3 April 1919 she departed for Scotland and alternately based on Kirkwall and Invergordon, Orkney Islands, swept the vast North Sea minefield.

[1] Arriving at Charleston Navy Yard on 1 December 1919 Eider was placed in reduced commission for repairs.

Placed in full commission again for passage to Mare Island, California, Eider sailed from Norfolk, Virginia, 10 July 1920 and arrived on 28 August to report to Commander, Train, Base Force.

[1] This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.