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Originally Posted by Sailor Steve

Ships hit by Herbert A. Werner
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^Actually as stated, no ships were hit by u-boats under Werner's command- U-415 & U-953. However in his service aboard U-230 as second officer, he probably hit the only one merchant Egyptian....sunk on patrol 7MAR1943 at 02.10 hrs. U-230 attacked the convoy SC-121 south-southeast of Cape Farewell and torpedoed the Egyptian. Siegmann thought that his victim sank and attacked the convoy again at 09.25 hours. He claimed the sinking of another ship with 5000 tons in the former position of the Steam Merchnt Egyptian, but it seems that both attacks were carried out on the same ship. The master, 36 crew, and nine gunners were lost. http://uboat.net/allies/merchants/crews/ship2723.html

Werner followed Commander Siegmann along with the crew to a U-boat familiarization (Baubelehrung) for a new boat in Oct and on 24 Oct 1942 they commissioned the new Type VIIC boat U-230 at Kiel.
On U-230 as First Watch Officer (1WO) young Ltn. Herbert A. Werner served on the boat for 171 days at sea during 4 patrols from Feb to Dec 1943. They only sank one small ship of 2,868 tons - as by this time the U-boats had become the hunted.

http://uboat.net/ops/convoys/convoys.php?convoy=SC-121 In the running wolfpack battle in which 10 merchants and one U-boat were sunk:

Before dark a sharp course change is ordered in an attempt to shake off the boats but without result:U-566 and U-230 make contact and the latter sinks one ship in the night. This event goes unnoticed in the heavy gale and the rescue ship is not warned.

AS 1WO in a heavy gale night attack which had to have been a surface attack...imho

First Watch officer: The second in command. He shadowed the CO closely so that he could take command if the CO fell ill or was killed in battle. His other responsibilities included the boat’s weapons systems and conducting torpedo aiming during surface attacks.

Thus, of the two attacks, Werner likely had to have gotten one of the hits at least. The second attack in daylight (9 gunners?) is naturally anyone's guess and was probably not a surface attack (0925) which might account for Seigmann's ID confusion and mistated tonnage.