|Date Activated||Date Sent Overseas||Date Entered Combat||Status as of June 1946|
|03 Mar 41||1 Sep 42 Hawaii||24 Apr 44 New Britian||inactivated 7 Apr 46|
The 40th Infantry Division's first oversea assignment was the defense of outer islands of Hawaii, where it arrived in September 1942. Training continued as defensive positions were improved and maintained. In July 1943 the Division was concentrated on Oahu, and relieved the 24th of the defense of the North Sector. Relieved of the North Sector in October 1943, the 40th entered upon a period of intensive amphibious and jungle training. On 20 December 1943, the first units left for Guadalcanal, and by mid-January 1944, movement was completed, and the Division prepared for its first combat assignment. On 24 April 1944, it left Guadalcanal for New Britain. The Regiments of the Division took positions at Talasea on the northern side of the island, at Arawe on the southern side, and at Gape Gloucester near the western end. Neutralization of the enemy was effected by patrols. No major battle was fought. Heavy rain and mud were constant problems. The 40th was relieved of missions on New Britain, 27 November, and began training for the Luzon landing. Sailing from Borgen Bay, 9 December 1944, the Division made an assault landing at Lingayen, Luzon, under command of XIV Corps, on 9 January 1945. Seizing Lingayen airfield, the Division occupied Bolinao Peninsula and San Miguel, and advanced toward Manila, running into heavy fighting in the Fort Stotsenburg area and the Bambam Hills. Snake Hill and Storm King Mountain were taken in February and the 40th was relieved, 2 March. Leaving Luzon, 15 March, 1945, to cut behind the Japanese, the Division landed on Panay Island on the 18th and knocked out Japanese resistance within 10 days, seizing airfields at Santa Barbara and Mandurriao. On 29 March, it landed at Pulupandan, Negros, advanced through Bacolod toward Talisay, which it secured by 2 April 1945. After mopping up on Negros Island, the Division returned to Panay in June and July 1945. In September 1945, the Division moved to Korea for occupation duty.
Activation date is the date the division was activated or inducted into federal service (national guard units).
Casualties are number of killed, wounded in action, captured, and missing.
Other Wars are the wars in which the division was mobilized.
The dates after the campaign name are the dates of the campaign not of the division.
The Army Almanac: A Book of Facts Concerning the Army of the United States; , U.S. Government Printing Office. Army Battle Casualties and Nonbattle Deaths in World War II, Final Report, 1 December 1941 - 31 December 1946.
US Army Center of Military History at http://www.history.army.mil/
Various divisional histories