A pacific battle. Americans with 3X the numberr ogf the Japanse. Tanks of the Japanese are also light tanks.
The concrete bunker proved to be a hard nut
The machine gun in the wood/ground bunker kept firing and wiped out an infantry unit.
A the end, numbers always count : the Japanese lines were overrun, but not without sustaining casualties.
To quickly going into close combat by the Japanese leaving the cover of the trenches speeded their doom.