25 Aug, 1942
While on patrol off Aland, ShCh-309 attacks a convoy and fires two torpedoes. The Finnish minelayer Louhi was missed in this attack.

30 Aug, 1942
While still on patrol off Aland, ShCh-309 sights another convoy and fires a torpedo against ' what is identified as ' a merchant of 6000 GRT. The torpedo missed its target.

4 Sep, 1942
While continuing her patrol off Aland, ShCh-309 sights another convoy and fires two torpedo against ' what is identified as ' a merchant of 10000 GRT. Both torpedo's missed their intended target.

11 Sep, 1942
ShCh-309 attacked another convoy and torpedoes and sinks the Finnish merchant Bonden (695 GRT) south of Aland in position 59º55'N, 19º54'E. (see map)

10 Nov, 1944
ShCh-309 torpedoes and sinks the German merchant Carl Cords (903 GRT) north-west of Ventspils, Latvia in position 57º30'N, 21º20'E. (see map)

12 Nov, 1944
ShCh-309 fires two torpedoes againt the German minesweeper M 22 west of Ventspils, Latvis in position 57º21'N, 21º00'E. Both torpedoes missed their target. (see map)

21 Nov, 1944
At 1724 hours ShCh-309 fires two torpedoes against ' what is identified as ' a destroyer 8 nautical miles north-west of the Sworbe lighthouse. Both torpedoes missed their so far unidentified target.

7 Dec, 1944
ShCh-309 torpedoes and sinks the German merchant Nordenham (4592 GRT) about 11 nautical miles north-west of Uzava, Latvia in position 57º24'N, 22º00'E.

This position is however on land, 21ºE seems more likely. (see map)

23 Feb, 1945
ShCh-309 torpedoes and sinks the German merchant Göttingen (6267 GRT) south-west of Libau in position 56º18'N, 20º16'E. (see map)

24 Feb, 1945
At 2324 hours ShCh-309 fires two torpedoes against ' what is identified as ' a merchant of 8000 GRT. Both torpedoes missed their target. Location of the attack was near Libau.

26 Feb, 1945
At 2315 hours ShCh-309 fires two torpedoes against ' what is identified as ' a merchant of 8000 GRT. Both torpedoes missed their target.

10 minutes later ShCh-309 fires another two torpedoes but these also missed.

Location of the attacks was near Libau.

19 Apr, 1945
While operating in the Pillau area, at 0502 hours, ShCh-309 fires two torpedoes against ' what is identified as ' an auxiliary minesweeper. Both torpedoes missed their target.

24 Apr, 1945
While operating in the Pillau area, at 0342 hours, ShCh-309 fires two torpedoes against ' what is identified as ' an auxiliary submarine chaser. Both torpedoes missed their target.