Dragon Pass in Heroes 5

Since the days of the first beings, the Great Trade Way connecting the northern and southern towns was guarded by Dragons. Since the road came to being, there has been intermittent warfare between the lands it traverses as all the local warlords try to control its riches. However, nobody has yet managed to break the dominance of Dragon guards and at the same time beat the armies of other contenders. Who will be the hero that achieves that feat?