Field of battle is a term used to describe a piece of land where two opposing armies engage in combat. There are several synonyms for this term that can be used interchangeably in order to add variety to your writing. One such synonym is "battlefield", which refers to the physical location where the battle takes place. Other synonyms include "war-zone", "combat zone", and "theater of war", which allude to the seriousness of the conflict and the potential danger that comes with it. Each of these synonyms can be used effectively in different contexts, depending on the tone and intention of the writer or speaker.