The Battle would be nothing without the location of the battle.
Describe what the battlefield will be like for the armies to clash upon, describe the geography of the land, sea or the air/space of areal or space battles. will the battlefield be open plane, rocky, hilly, forest, desert, arctic, subterranean, is the weather calm, clear, windy, rainy, stormy?
Describe Sea battles, is there land masses nearby, any naval bases? describe the condition of the seas, calm, wavy, or if there are reefs or rock formations that would tamper with the battle.
Describe what is in space, are there moons, planets, asteroid fields, suns? Describe the Cosmic whether or phenomenons that would happen there.
Describe what kind of defenses do the defenders have for siege battles, do they have walls? what kind? any other defenses like towers? catapults? hot oil? etc. are there trenches, shields, barriers?
Unless it is a known locations for each battle, lore-wise, please supply the link that would give a description for itself.
If something were to happen on the battlefield that is outside either force's influence, storms, earthquakes, Supernovas, etc.. please describe them, It is important to know what happens that would alter the course of the battle.