In late January, "Indiana" took part in operations to prepare for the invasion of Kwajalein in the Marshall Islands. On 29 January, the ship attacked Maloelap Atoll, along with "Washington" and the aircraft carriers and , and the following day the ships began bombarding Kwajalein to soften Japanese defenses. On 30 January, "Indiana", "Massachusetts", and "Washington", escorted by four destroyers, were detached to shell Kwajalein as part of the invasion bombardment. They reached their firing positions early the next morning and "Indiana" opened fire at 09:56; she and the other ships sank a submarine chaser and five guard ships that were moored in the atoll. Japanese artillery batteries engaged the American ships, but "Indiana" was not hit. She continued to bombard Japanese positions around the island until 14:48 before departing at 17:15 to return to the carriers. She had fired some 306 shells from her main battery and 2,385 rounds from her 5-inch guns.