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I completed it on a difficult setting in 4 months. To my surprise, the Orcs didn't attack me, so I went around and beat everyone up myself. I played as a Warrior, focusing on the Blood path. In battles, I mainly used the Support skill, Battle Cry, Heroism, and Guardian Angel. Thanks to these perks and the healing from Vestals, I managed to clear the entire map. I didn't develop magic at all; the only spell I unlocked was Inner Flame, but I didn't even have time to use it.
P.S. Towards the end of the map, I got lucky with an artifact that gave +8 to magic power and the Dominate spell, which made fighting the tough neutral creatures much easier.