Would german and Japanese civilians have the same rights to claim against the American and British as victims of the Nazis and Japanese do for supposed war crimes? Why or why not?

A skirmish breaks out over a disputed area between the border of two nations. Each country claims ownership of the area, although there are people living there who hail from both sides. The skirmish escalates until both countries are sending tanks and airplanes to secure what they believe is their property. One commander manages to capture a local police precinct, executing the head of police and his deputies. Later, when called to account for the deaths of these civilians, which specific charge would the commander MOST likely be charged with?

⚪ crimes against humanity

⚪ war crimes

⚪ genocide

⚪ terrorism