At 01.16 hours on 22 Sep, 1942, U-211 fired a spread of two torpedoes at the unescorted Esso Williamsburg (Master John Tweed), which was steaming at 15 knots about 500 miles south of Cape Farewell, Greenland. Two hits were heard, but the tanker continued and the contact was lost due to very poor visibility, so they probably missed.
At 00.26 hours on 23 September, one torpedo was fired from about 2000 yards, which struck amidships, causing a violent explosion and set the ship on fire. Ten minutes later, the stern torpedo was fired but missed. At 01.05 hours, another torpedo was fired, which struck on the starboard side amidships, causing the entire ship to light up in flames. The tanker broke completely in two and U-211 left the scene with both parts of the tanker still sinking. None of the eight officers, 34 men and 18 armed guards (the ship was armed with one 5in, one 3in, two .50cal and two .30cal guns) survived the sinking. A weak distress signal was received by a shore station, but an extensive air and sea search failed to locate any survivors or wreckage.