"Tartar" resumed her duties with the Home Fleet in June 1941, when she was attached to a small force whose aim was to capture a German weather ship to obtain an Enigma coding machine and associated documentation. On 26 June she escorted the cruiser with "Bedouin" from Scapa Flow to the waters off Jan Mayen Island. On 28 June the task force spotted the and a boarding party from "Tartar" seized control of the vessel, recovering important documentation. "Tartar" then sank "Lauenburg" with gunfire. On 27 July she carried out reconnaissance of Spitsbergen to assess the possibility of using the island as a refuelling base for Russian convoys.