Battle of Yultong:
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Instead of retreating, the Pinoys dug up and fought back.
Ha.....oh boy, where to start?
First of all, it was never really a "war", but police action. Truman never declared war via the conventional congressional process.
Second, a total of 7,420 Filipino soldiers served in Korea from 1950 to 1955 including the end of the Korean War in 1953 and until 1955 consisting of five Battalion Combat Teams (BCTs).
Given that the total number of service personnel to to have fought in this "police action" was estimated to be almost 2 million combined, then the Philippine contribution could not be defined as decisive in any scenario.
Third, it's an exaggeration.
The battle referred here was probably the Battle of Yultong on April 22-23, 1951, as a part of 1st Chinese Spring Offense (aka The Fifth Campaign 第五次戰役 by Chinese).
The 44th Division of 15th Army of CPV were assigned to attack the 65th Regiment of the US 3rd Infantry Division. CPV 44th Division had 131th Regiment and 132nd Regiment at the front and kept 130th Regiment in reserve. 2nd Battalion of the 132nd Regiment was the one directly attacked the sector of PEFTOK (Phillipine Expedition Force to Korea) with 1st and a part of the 3rd battalion going around the sides.
The strength of PEFTOK was about 900 at the time. However, there was no way that they faced 40,000 Chinese soldiers. A Chinese division had around 10,000 soldiers then. Thus the Filipino troops won't face more than 1,500 Chinese soldiers any time that night. I believe it's more likely an even match in strength for both sides in this battle.