High Quality Content by WIKIPEDIA articles! Eider sailed out of Philadelphia, Pennsylvania, for minesweeping operations in the Delaware River approaches until 8 March 1919, then put in to 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. Returning home in October she called at Brest, Lisbon, the Azores and Bermuda.