At 00:18 hours on 27 May the unescorted 6,269 ton Dutch merchantman Polyphemus, en route from Halifax to Liverpool, was hit by two torpedoes from U-578 about 340 miles north of Bermuda and sank within 45 minutes, with the loss of 15 of the crew.
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At 00:24 on 23 May, while en route from Halifax to Saint Thomas, U.S. Virgin Islands, the unescorted 4,455 ton British merchant ship Zurichmoor was torpedoed and sunk by U-432 east of Philadelphia.
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