Together with her sisters "T5", "T7" and , the boat supported German forces invading the Estonian islands of Ösel, Dagö and Muhu (Operation Beowulf) in mid-September. "T2", "T5", "T7", "T8" and "T11" were among the escorts for the Baltic Fleet, a temporary formation built around the battleship , as it sortied into the Sea of Åland on 23–29 September to forestall any attempt by the Soviet Red Banner Baltic Fleet to breakout from the Gulf of Finland. Dagö was captured on 12–13 October after "T8" is part of a decoy force used to distract the defenders. Manpower shortages forced the boat to be reduced to reserve in December. The boat was recommissioned for service, probably as a training ship with the Torpedo School, in July 1942 and then began a refit at Elbing, East Prussia, in October 1943 that lasted until January 1944. Afterwards, she was assigned to the 2nd Torpedo Boat Flotilla and participated in a failed attempt to recapture the island of Narvi on 27/28 June together with "T10", the torpedo boat and Finnish forces. The three torpedo boats damaged a Soviet patrol boat off Narva, Estonia, on 16 July. "T8" screened the heavy cruiser "Lützow" as she bombarded Soviet positions near Frauenburg on 8 February 1945. She was sunk by British aircraft on 3 May in the Kieler Förde at . Her wreck was demolished by depth charges on 10 December.