I'm looking for a movie title. I watched the movie about 10 years ago while visiting England. I have snippets of the plot from memory:

The plot centers around a Japanese POW camp in WWII. The prisoners were either British or American; and the Japanese officer in charge was given a nickname like "Black Bastard" or the like. Prisoners would be beaten on a daily schedule in the main courtyard of the camp. At one point, the Japanese officer in charge is killed(?) and there is some sort of official investigation/trial. Also, at another point, one of the prisoners leads others to a mass grave of prisoners--where I think his brother was killed?

If this sounds familiar, please help!