At the beginning of your first turn. Take all your men south of Korinthos and have them prepare for an ambush against the Mak army from Korinthos. (there's a nice little spot you can ambush them in between Korinthos and Sparta. You should be able to ambush them which will save Sparta from a seige. Then on your next turn you can take Korinthos. Then move your men on to relieve the seige at Athens if their men attack there. And then you can take Chalkis, Pella, and Demetrias.