German submarine U-47 detected Allied convoy HX-72 400 miles west of Ireland. With only one torpedo left and seeing so many potential targets (the convoy contained 41 merchant ships and had only 4 destroyers, 1 sloop, and 2 corvettes in escort), commanding officer of U-47 Günther Prien radioed the finding to eight other German submarines. Between 0312 and 0447 hours, German submarine U-99 sank British tanker Invershannon (16 killed, 32 survived), British ship Baron Blythswood (entire crew of 34 killed), and British ship Elmbank (2 killed, 54 survived). At 0614 hours, German submarine U-48 sank British ship Blairangus (6 killed, 28 survived). At 2310 hours, German submarine U-100 sank British ship Canonesa (1 killed, 62 survived), British ship Dalcairn (entire crew of 48 survived), and British tanker Torinia (entire crew of 55 survived). At 2338 hours, U-48 struck again, damaging British ship Broompark (1 killed).
