Originally Posted by
Dago Red
There is no Persian invasion.
I think there's some confusion about DeI's WoS campaign, which is not at all set in 432BC at the outset of the Peloponnesian War. It's set more than 200 years later (around 214BC) and a century after the death of Alexander. This is a conflict between Makedon and their few allies versus most of the Greek kingdoms/leagues and their allies, namely Rome.
There is a submod to revert to the original WoS time and factions, but it's not too polished and there are some bugs as well. And even here, there really is no Persian invasion -- they are one province on the eastern border of the map and they did not play much of a battlefield role in the Pelponnesian Wars.