According to my dad, who was a pistol instructor in the army, that war was when they decided the old 38 revolvers weren’t good enough and went to a 45ACP. The Moros supposedly were taking a drug to make them aggressive, tireless, strong, and impervious to pain. 38s had no effect.
They also wrapped hemp rope around their torso to keep the .38 caliber projectile from doing much damage as it passed through their bodies. The .45 ACP left all of its 900 lbs of knock down power within their body cavity. I have seen some photos of the results of both. I also carry a .45 and I have since I was 18 years old. To steal a phrase... "Don't leave home without it".
LLS