The convoy leaves Takoradi on the 18th and during the following days the corvette picks up a lot of radio signals from U-boats operating in the vicinity. She does however not send a distress signal but keeps radio silence. A request for urgent reinforcement is signalled by the Aldis-lamp to a passing Hudson patrol aircraft. But the pilot makes only a routine rapport on his return and so the call for help is lost.

This proves to be fatal when U-515, commanded by one of the most experienced U-boat officers, makes contact in the late afternoon of the 30th and attacks at dusk. In three approaches she sinks 4 ships before midnight and another 3 in the morning. After the second attack the escort is reinforced by three destroyers coming from Freetown. U-515 breaks off the fight.