Calixto Duque is in Mindanao and wasn't able to return which eventually became part of the Visayas-Mindanao Force of General Sharp.

The Battle of Bataan started in January 9142 until April 1942 which lasted three months denying the Japanese plan to complete the invasion for 50 days.

After the Battle of Bataan on 9 April 1942, the local forces under the PCA 1st Regular Division surrendered to the Japanese Imperial troops.

The now infamous Death March commenced the following day with more than 78,000 Filipino and American POWs from Mariveles, Bataan to San Fernando, Pampanga, and by train to Camp O'Donnell in Capas, Tarlac.

After the Fall of Bataan in April 1942 the surrendering of troopers of the 1st Regular Division was incarcerated for a few months but released and some officers and men went to the hills to join guerilla units until the liberation of the Philippines by returning American forces in 1945.

The Division was formally reactivated just in time for the PA's final offensives in the Central Luzon region against the HMB on 1 March 1956.

The Headquarters of the 1st Infantry (TABAK) Division is located on a 422.81-hectare (1,044.8-acre) military reservation surrounding Barangay Upper Pulacan, in Labangan, Zamboanga del Sur.

On 4 May 1991, the Camp was named in honor of Major Cesar L. Sang-an who died defending the country's sovereignty against a superior number of MNLF forces of Barangay Malaning, Labangan, Zamboanga del Sur on 23 March 1973.

The 1st Infantry (TABAK) Division, Philippine Army to conduct reinvigorated Internal Peace and Security Operations (IPSO) in the AOR to neutralize the CTM, destroy the ASG and JI, hold and contain MILF forces while continuing to observe the primacy of the peace process and neutralize other threat groups in order to establish a physically and psychologically secured environment conducive to progress and development.

When Japanese hostilities broke out on 8 Dec 1941, the 1st Regular Division was only at cadre strength (just its commissioned and senior non-commissioned officers).

Fidel V. Segundo (PA), set his hand to the task of continuing to bring the Division's units back up to as full a strength possible, all the while fighting a difficult staged retreat from South Luzon into the Bataan peninsula.