The Rascals(2005)

Original title: เด็กเดน

A love affair between a high-school boy and a beautiful girl sets off a battle between students at two colleges. The fight causes too many people to be injured when the violence spirals out of control. The unruly students are sent to to a remote military camp to be reformed. Later, they plan to escape, but it's not what their plan should be when they find themselves stuck in a battlefield instead of escaping away from the camp.