Have 1 player focus on walling off all chokepoints except the one that is closest to the enemy village.( one village will always be significantly closer then the other) While player 1 does that player 2 focueses on getting to fotress age and builds a fort next to the entrance and builds a temple to train monks. have monks convert as many elite soldiers as you can.
Another tip is actually a requirement. You need a balanced army to win. Player 1 in my case built cavarly to take care of any seige that tried to slips by,(unlike the other missions this one they only bring battering rams, no ballistas or palintoons.) A premium greek member makes this missions easier for spamming the age 3 units from the fort that you recieve only from your advisor card. If this is not an option i recomend using hoplites instead. Remeber these are just a wall for your priest to convert.
An obvious tip is economy. A booming economey is needed to supply your constantly dieing army in this mission. Caravans are a must because the gold mins will run out very quickly. Though you have acces to ocean next to your base I recomend not building any docks or ships to not atract the attention of the sea people's elite navy.