War. It's called war. In ye olden days, military forces pillaged farms (for food) and sacked cities (for loot). Rarely, there have been short eras of formalized military v military conflicts within various cultures, but this was not the norm. In more modern times, military forces destroys enemy infrastructure to degrade their ability to make war directly target civilians to reduce the # of enemies and hurt morale (supposedly). While sad, one of the facts of life is that war leads to civilian deaths. Usually far more than direct military deaths.
