At 07.25 hours on 7 Mar, 1941, the Mijdrecht (Master J. Swart) in convoy OB-293 was hit by one torpedo from U-70 and continued at slow speed. The tanker rammed the U-boat as it tried to deliver a coup de grâce and reported the position to the escorts. The ship arrived in Rothesay Bay on 19 March, was temporary repaired at Govan and later went to Middlesbrough for permanent repairs.

The conning tower of U-70 had been badly damaged, but the pressure hull remained intact and Matz decided to head away from the convoy for repairs. At 08.15 hours, the HMS Camellia (K 31) sighted the U-boat on the surface, which dived shortly afterwards. Until 10.30 hours, this corvette and HMS Arbutus (K 86) carried out five attacks with depth charges, followed by another four attacks by HMS Camellia (K 31). Altogether the corvettes dropped 48 depth charges in the nine attacks. The U-boat was forced to surface at 12.44 hours after the last attack and had to be abandoned by the crew. 25 survivors were picked up by the corvettes.