| Unit Name: | 51st Division |
| Dates: | September 1941 - 9 April 1942 |
| Branch: | Philippine Army |
| Type: | Infantry Division |
| Role: | Infantry |
| Size: | 6000 |
| Command Structure: | South Luzon Force (II Philippine Division) |
| Current Commander: |  Col.Adlai C. Young BGen. Albert M. Jones |
| Garrison: | Tanauan, Batangas |
| Commander1 Label: | Commanders |
| Ceremonial Chief: |  LCol. Ricardo Poblete, PA Col. Stuart C. MacDonald |
| Commander2 Label: | Chief of Staff |
| Commander3: | G1 Maj Carreon G2 Capt A. Soriano G3 LCol. E.E Adridge G4 Capt H.E White |
| Commander3 Label: | General Staff |
| Garrison Label: | Cantonment |
| Battles: | World War II
|
The 51st Infantry Division was a division of the Philippine Army under the United States Army Forces in the Far East (USAFFE).
The 51st Division was active from 1941 to April 9, 1942, where upon it surrendered when Bataan fell. Previously it was active in the east of Southern Luzon and Bicol Peninsula. BGen. Albert M. Jones (USA) was the division's commander; the Chief of Staff was LCol. Ricardo Poblete, PA and Col. Adlai C. Young, Inf., was another notable division officer who later commanded the division when General Jones temporarily moved to command South Luzon Force and later when General Jones took command of I Philippine Corps in Bataan. It posted its headquarters in Tanauan, Batangas in September 1941 until withdrawn to Bataan.
After the Japanese invasion of the Philippines in December 1941, it formed part of the South Luzon Force (activated December 13, 1941) under Brig. Gen. George M. Parker Jr. The South Luzon Force controlled a zone east and south of Manila. Parker had the PA 41st and 51st Infantry Divisions and the 2nd Provisional Artillery Group of two batteries of the U.S. 86th Field Artillery Regiment (Philippine Scouts).[1]
When the Japanese began landing at Lamon Bay on December 24, 1941, South Luzon Force was badly dispersed. The 41st Division (PA) on the west coast was in position, but elements of the 51st Division along the east coast were in the process of movement.
General Jones was temporarily removed from the command to take over South Luzon Force as General Parker was ordered to Bataan to prepare for the withdrawal of all forces there. General Jones led entire South Luzon Force (SLF) withdrawal to Bataan.
General Jones resumed command of the division when it reached Bataan and part of II Philippine Corps defending the eastern coast of Bataan.The division engaged Japanese assault in Bataan and the division reduced to small due to casualties and sickness. It also caused the life with one of the regimental commanders, LCol Loren P. Stewart commander of 51st Infantry Regiment, Col Adlai Young took 51st Infantry Regiment . General Jones relinquished the command of the division in March 1942 to command I Philippine Corps.
Days before surrender remnants of the division was reorganized as 51st Combat Team under Colonel Adlai Young Jr. The 3 (51st, 52nd, and 53rd) Infantry regiments are now down to battalions and the 51st Field Artillery is now down to a battery. He commanded the unit until its surrender[2] .