Convoy ON 67 Convoy ON - 67 was a trade convoy of merchant ships during the second World War . It was the 67th of the numbered series of ON convoys Outbound from the British Isles to North America . The ships departed from Liverpool on 14 February 1942 with convoy rescue ship " Toward " , and were escorted to the Mid - Ocean Meeting Point by escort group B4 . The Escort Group . On 19 February , the American task unit 4 . 1 . 5 assumed escort responsibility with Gleaves class destroyer s " Edison " and " Nicholson " , Wickes class destroyer s " Lea " and " Bernadou " and the Canadian Flower class corvette HMCS " Algoma " . " Edison " s commanding officer , Commander Albert C . Murdaugh , USN , was the senior officer of the escort group . The escort group had never operated together before . " Bernadou " had been modified for long range escort work by replacing the fourth boiler and stack with an extra fuel tank . " Toward " carried a HF / DF high - frequency direction finding set , and " Nicholson " had the only functional radar . " Lea " carried a British ASV aircraft radar with fixed antennae , but the coaxial cable to the antennae was repeatedly shorted by salt water spray . " Edison " had no depth charge throwers , and was limited to a linear pattern rolled off the stern . The American ships did not have enough binoculars . " Bernadou " had a 7x50 pair for the officer of the deck and a 6x30 pair for the junior officer of the deck but there were none for the lookouts . " U - 155 " . " U - 155 " found and reported the convoy on 21 February . " Toward " obtained a bearing on the contact report , and " Lea " searched the bearing unsuccessfully at dusk . " U - 155 " approached the port quarter of the convoy in the pre - dawn hours of 22 February and torpedoed the British tanker " Adellen " and Norwegian freighter " Sama " . Both ships sank quickly . " Algoma " rescued eleven of " Adellen " s crew of 31 while " Nicholson " and " Toward " found twenty survivors from " Sama " s crew of forty . " U - 155 " crash - dived to avoid " Bernadou " , but the destroyer never saw the U - boat . " U - 155 " made another emergency dive while shadowing the convoy at 1042 , but " Edison " did not detect the U - boat . " U - 587 " , " U - 69 " , and " U - 558 " found the convoy on 23 February . " U - 558 " . " U - 558 " approached the convoy at 2120 , but repeatedly turned away to avoid " Bernadou " s patrols until a squall provided cover at midnight . " U - 558 " torpedoed the Norwegian tanker " Inverarder " at 0045 24 February . The tanker sank slowly and " Toward " rescued all 42 of the crew . " U - 558 " approached again at 0230 and fired a single torpedo at " Edison " . The torpedo missed , and " Edison " was unaware it had been fired at . " U - 558 " torpedoed the Norwegian tanker " Eidanger " at 0255 . " U - 558 " reloaded and at 0550 torpedoed the British tankers " Anadara " and " Finnanger " , and the British freighter " White Crest " . All three ships straggled and were sunk . Later that morning , the convoy commodore sent a signal to the escort commander regarding the performance of " U - 558 " : " That chap must be one of their best ones . I do hope you have done him in . " U - 158 . " U - 158 " located the convoy at 0425 24 February and torpedoed the British tanker . " Empire Celt " was testing a new Admiralty Net Defense system by streaming a strong steel net from poles along either side of the ship . One torpedo broke through the net and hit amidships . " Empire Celt " later broke in half , but a tug from Newfoundland rescued 31 from the crew of 37 . As " U - 558 " was torpedoing ships on the starboard side of the convoy , " U - 158 " approached the port side and torpedoed British tanker " Diloma " at 0635 . " Diloma " was the only one of the torpedoed ships to successfully reach Halifax . Both " U - 158 " and " U - 558 " dived to avoid being seen in the early daylight . " U - 558 " found and sank the " Eidanger " , drifting and abandoned astern of the convoy , with gunfire and a torpedo . All of " Eidanger " s crew had been rescued . " Lea " investigated a DF bearing from " Toward " at 1515 and spotted " U - 558 " twenty miles ( 32 km ) astern of the convoy at 1707 . " Lea " dropped eight depth charges at 1746 , and then surprised the U - boat on the surface at 1813 and dropped fourteen depth charges at 1847 . " U - 558 " was undamaged . " Nicholson " investigated a DF bearing from " Toward " and sighted " U - 158 " at 1323 . " U - 158 " dived and evaded " Nicholson " . " Nicholson " then slowed to listen . " U - 158 " surfaced at 1550 and was surprised to find " Nicholson " waiting 1500 meters away . " U - 158 " crashed - dived before " Nicholson " saw the U - boat . " U - 158 " surfaced again at 1817 and was surprised to find " Edison " away . " U - 158 " again avoided detection by crash - diving . " Edison " finally spotted " U - 158 " making another convoy approach at 2008 and dropped 25 depth charges over the following six hours . " U - 158 " was undamaged , but had been prevented from making further attacks on the convoy . Admiral Karl Dönitz , the BdU or commander in chief of U - Boats , ordered his U - boats to discontinue the attack on 25 February . The escort was reinforced on 26 February by the USCG Treasury Class Cutter " Spencer " . The remainder of the convoy reached Halifax on 1 March 1942 .