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The first positive mine sightings had been made on 4 September, southwest of Chinnamp'o, by the destroyer USS McKean (DD784); three days later British units heading north through these same waters had encountered many floaters;

on the10th the Korean PC 703 had sunk a mine-layer off Haeju and had reported that the mouth of Haeju Man had been mined.

In Tokyo, on that same day, Admiral Struble had discussed the mine problem with CincFE: if contact mines had been placed in the Inch'ŏn approaches, it was the opinion of Commander Joint Task Force 7 that the Attack Force could be pushed through; if the approaches had been salted with modern influence mines the situation was more doubtful; all that could be done was to go on up and see. A conference with ComNavFE led to a recommendation to CincPacFleet for the earliest possible reactivation of more AMS; on the next day Admiral Radford passed this request to CNO and himself started additional sweepers to the Far East.