How to name battles in the Antiquity Period?

We all know that every battle have their own name, usually named after a location. However, how do historians name old battles during the antiquity when settlements are scarce and battle is usually in the open rather than near the settlement. One notable example is Battle of Teutonberg Forest where the battle take place in the forest.

So how do historians name battles?

Besides the purpose because I play Total War and I like to name every important battle, just like history