"Amagiri" returned to Rabaul by March 1943, and resumed its missions as a high speed transport. On 7 April, she was strafed by a USAAF B-17 Flying Fortress bomber, killing 10 crewmen. On 5–6 July, during the Battle of Kula Gulf "Amagiri" was engaged by United States Navy destroyers and cruisers while attempting a troop transport mission to Kolombangara. She took five shell hits, which killed 10 crewmen. After the battle she attempted to rescue the survivors of the destroyer , but was driven off by the American destroyers and and returned to Rabaul for repairs.