On 10 April 1944 Ingersoll became the commanding officer of the light aircraft carrier , which operated in the Pacific Ocean in the United States Third and Fifth Fleets. He commanded "Monterey" during the Battle of the Philippine Sea in June 1944 the Battle of Guam in July–August 1944, air strikes by the Fast Carrier Task Force against Formosa in mid-October 1944, and the Leyte campaign and Battle of Leyte Gulf later in October 1944. He received the Navy Cross for his actions during the Formosa raids and the Battle of Leyte Gulf, the citation reading in part: