"U-258" and "U-650" maintained contact through the night, and "U-258" was submerged ahead on the convoy at dawn on the 29th. As the convoy passed overhead at 0530, "U-258" rose to periscope depth and launched two torpedoes at "McKeesport". After one torpedo hit "McKeesport" on the starboard bow, "Northern Gem" detected "U-258" and dropped three depth charges. "Snowflake" dropped a single depth charge on a doubtful SONAR contact at 0605 and two more depth charges at 0615 after contact was regained at a range of . "McKeesport" was abandoned and sunk by the escort to prevent discovery of classified documents by German boarders. "Northern Gem" rescued all but one of the crew. "U-258" had also been damaged, and was forced to return to base. The Admiralty arranged reinforcements for ONS 5 in response to this battle. HMS "Oribi" was detached from SC127, and destroyers "Penn", "Panther", "Impulsive", and "Offa", of the 3rd Support Group under Capt. J.M. McCoy, RN, sailed from Newfoundland. Weather rapidly deteriorated, and the convoy was sailing into a full gale by late afternoon of the 29th. About 1700 "Sunflower" was struck by a wave which filled the crow's nest with water. "Oribi" was slowed to 11 knots by the storm, but joined the convoy at 2300 as "Tay" was attacking a U-boat astern. At 2312 "Duncan" obtained an ASDIC contact at ; and both "Duncan" and "Snowflake" dropped depth charges to discourage the U-boats.