Set right before the fall of Thailand's old capital, Ayuttaya, Bang Rajan draws on the legend of a village..
The Burmese army is seeking to invade Ayutthaya, the capital of Siam.
Seeking to block the invasion is a small band of villagers in Bang Rajan. The forces are at first led by Nai Taen, who is injured in an early battle. The villagers then turn to an outsider, Nai Chan Nuad Kheo, a moustachioed, veteran warrior. He brings along a handful of other men, who with the remaining men and women of Bang Rajan vow to put up a fight.
They use all their resources to prepare the village for a siege, including melting down all available metal farming implements into a crudely constructed cannon. Lacking horses, the village drunkard, Nai Thongmen, mounts an old water buffalo and rides the draft animal into battle.
