At 23.57, 23.58 and 24.00 hours on 27 June 1941, U-123 fired one torpedoes each at three ships in convoy SL-78 from between the columns west-southwest of the Canary Islands. The first torpedo sank P.L.M. 22, the second the Oberon and the third missed the intended target, but was thought to have hit another ship in convoy.

The Oberon (Master E.O.J. Jans) was struck by a torpedo in the engine room, killing four men on watch below and a purser. The survivors were picked up by a British corvette, but one man later died of wounds.

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