Contrary to common belief Germans did not invented the concentration camps - actually British were the first to use them during Boer Wars between 1900 and 1902. Of course previously similar concepts were used by Russian, Spanish and other nations, but British were the first to use them on large scale and turn refugee camps into camps, where Boer insurgents were kept. German Empire used such camps between 1904 and 1908 during their racial extermination of Herero and Nama people in German South-West Africa (now Namibia). In Nazi Germany, under ruling of Adolf Hitler, started building concentration camps in 1930s to imprison in them their political opponents and, after Heinrich Himmler took over the command over concetrations camps, also "racially undesirable elements", like homosexuals, criminals, Jews and Romani. Russians also used concentration camps for similiar purposes, but usually on much smaller scale and usually against their own people seen as politically dangerous rather than based on race or religion. When World War 2 started with expansion of their territory Germans spread their camps all over Europe - they built them in Poland, Lithuania, Austria, Ukraine, France, Belarus, Norway, Croatia. Some of them, were extermination camps - built not to keep people in them, but to systematically kill them using poisonous gas and later bury them in mass graves or burn them in crematoria. But even people kept in non-extermination camps often died in large numbers due to starvation, malnutrition, diseases or medical experiments. Japanese Imperial Army was also very active during World War 2 in creating concentration camps, where people were ofren tortured or used for medical experiments, they also often organized the "death marches", during which people who were about to be imprisoned in the concetration camp had to travel by foot to the camp, during which a lot of prisoner died due to exhaustion.
The film is about the judicial process in a POW camp during World War II. Preserver is recently arrived William Hurt, who is embroiled in a difficult game.
War films are not always showing the war per se - often the main theme is the influence of the conflict on lives of people involved, but also their families and friends. War is seldom a local thing - the trauma, the pain, the death they put their mark on people from around the world.