The battle is being fought over a much older battleground, where the forebears of the armies once clashed. Perhaps the remnants of the battlefield can be still seen where a famous last stand was made, or maybe the victorious army raised up a monument to its general. The acropolis of heroes can be represented by a small patch of tumbled down columns, a group of Dwarfen oath stones, a cairn of skulls and so forth.

The unit controlling the acropolis of heroes always counts as outnumbering its enemies, regardless of the actual unit strengths involved in the fight.