In November 1943, BatDiv 8 participated in the assaults on Tarawa, Makin and Abemama in the Gilberts and covered the aircraft carriers while they raided the islands. Davis then commanded BatDiv 8 during the Mariana Islands campaign at Saipan, Tinian and Guam in June–August 1944 and received Legion of Merit for his service. He continued in command of his division during the Invasion of Leyte, Philippines in late 1944 and was decorated with second Legion of Merit.