Siyama: Village of Warriors (2008)

Anna, Gif, and Bote from present day Bangkok are thrown into a gateway through time after coincidentally conversing about the history of warfare that took place in the ancient days of what was then called Siam. They return to the time when the people of Siam fought to protect the capital city of Ayuthaya from the invaders. The conflict takes place between a small group of farmers who do not want toleave their country and are willing to fight to the death against the army Ong Mien. The trio suddenly appear out of no where right at the onset of battle causing utter confusion and havoc among the soldiers. The three of them are forced to put their book-learned history knowledge to the test to see if they can save Siyama from being trampled through.