Are these sentences worded in the correct way?

With the conquest of the Great Glacier complete, Iyraclea ordered Zethrindor to lead her troops east against Sossal, a druidic nation that had already been weakened over the previous few months by attacks from frenzied dragons. Invading the southern part of Sossal, where the principal settlements were located, Zethrindor’s forces decimated the Sossrim army and gained control over that part of the realm. The surviving Sossrim fled north and separated into several companies to make it easier to avoid notice while preparing for a counteroffensive. (