レンネル島沖海戦
"Montpelier" arrived in Nouméa, New Caledonia on 18 January 1943 from Norfolk, Virginia Rear Admiral A. S. Merrill chose her for the flagship of Cruiser Division 12 (CruDiv 12). On 25 January, she reached Efate, New Hebrides, her home base for the next few months. While making a sweep around beleaguered Guadalcanal, she participated in the Battle of Rennell Island on 29 January, the last naval engagement of the Guadalcanal Campaign.