6 Feb, 1942
S-101 fires two torpedoes against the wreck of the Norwegian merchant Mimona (1147 GRT, offsite link) off Berlevåg.

25 May, 1942
S-101 attacks the German hospital ship Meteor (3715 GRT) off the Tanafjord. The target was not hit and S-101 was attacked with depth charges by the German auxiliary submarine chasers UJ 1105, UJ 1102, UJ 1108 und UJ 1109. S-101 was damaged during these counter attacks but eventually managed to escape.

22 Mar, 1943
S-101 fires four torpedoes against a German convoy missing the German merchant Drau (5141 GRT) off the Kongsfjord.

22 Mar, 1943
S-101 fires three torpedoes against a German convoy north-west of Nordkyn. None of the torpedoes fired found their targets.

29 Mar, 1943
S-101 possibly torpedoes and sinks the German merchant Ajax (2297 GRT) off the Kongsfjord in position 70º49'N, 29º30'E.

I have also seen this ship listed as being sunk by S-55. (see map)

25 Apr, 1943
S-101 attacks a German convoy of the Kongsfjord in position 70º55'N, 29º30'E. 4 torpedoes were fired but all of these missed astern. (see map)

13 Jun, 1943
S-101 fires 4 torpedoes against a German convoy of the Kongsfjord. None of the torpedoes hit their intended targets.

14 Jun, 1943
S-101 fires 2 torpedoes against ' what is identified as ' a merchant of the Kongsfjord. Both torpedoes missed their target.

19 Jun, 1943
S-101 fires 2 torpedoes against the German auxiliary patrol vessel V 6108 of the Kongsfjord. Both torpedoes missed their target.

22 Jun, 1943
S-101 fires 4 torpedoes against ' what is identified as ' a merchant of 7000 GRT of the Kongsfjord. All torpedoes fired missed their target.

23 Jun, 1943
S-101 fires 2 torpedoes against the German minesweeper M 35 of the Kongsfjord. Both torpedoes missed their target.

28 Aug, 1943
The German submarine U-639 was sunk on 28 August 1943 at 1030hrs in the Arctic Ocean (Kara Sea) north-east of Mys Zhelaniya, in approximate position 76º49'N, 69º42'E, by torpedoes from the Soviet submarine S-101. (see map)

31 Oct, 1944
At 0808 hours S-101 fires four torpedoes against the German auxiliary patrol vessels UJ 1207 and UJ 1222 of the Laksfjord. None of the torpedoes fired found their intended target.

At 1515 hours S-101 fires four torpedoes against the German auxiliary patrol vessel UJ 1222. Once again all four torpedoes missed their target.