Hiroki Nakajima

Set during the 1930s after the Japanese invasion of Manchuria, a teacher (Jing Tian) and a group of students establish a study club to preserve their language and culture as an act of protest against the foreign invaders. (imdb)

The soldiers no longer know why they are at war, and when it even started. Daily and dutifully they march to the river and shoot at the opposite village from 9 to 5 - orders are orders after all.