471 points!
As it turns out, you really don't much more than some spearman to clear the first half of the game and adding calvary with the right upgrades pretty much covers you from there. I scored his score was achieved with no repeated battles and all innocents saved. None of my fighting units were actually ever killed, but I slowly "Spent" my peasants in order to collect the Innocents without having to pay to heal up the peasant units.