Dragons indeed were the main weapon in the conquest of the island, but first the Urok's forces had to raise a city to support their production. All of their military units swept quickly southward and removed all the defenders near the mine; the construction of the necessary buildings were begun in earnest. During this time, they erected many guard towers to deal with the constant harassment of enemy gryphons; a shipyard went up to produce tankers and destroyers for the same purpose.