 Nevertheless , the ship 's armament was again revised after leaving Italian service , this time consisting of six 8 @.@ 4 cm ( 3 @.@ 3 in ) anti @-@ aircraft guns , four 4 @.@ 7 cm ( 1 @.@ 9 in ) anti @-@ aircraft guns , four 20 mm Oerlikon anti @-@ aircraft guns , and twenty @-@ six 20 mm Breda anti @-@ aircraft guns , and she was commissioned on 8 November . On the night of 21 – 22 September , while she was still refitting , two British Motor Torpedo Boats — MTB 226 and MTB 228 — attacked the ship to the northwest of Zara without success . Niobe began escorting convoys in the Adriatic , the first taking place of 13 November . This convoy consisted of several transports carrying units from the 7th Infantry Division to the islands of Cres , Krk , and <unk> . 
