sentences:  The convoy passed a Southbound convoy around midnight while about off Blakeney, Norfolk, with the two convoys passing starboard to starboard; this was unusual since ships and convoys should pass port to port.No ships showed any lights because of the risk from German E-boats.However, an armed escort trawler, "Peter Hendriks" in the southbound convoy accidentally struck "Umpire" sinking her in 18 metres of water.