Are these sentences properly worded?

FYI- Malark is the spymaster and Szass Tam is the lich. Following Malark’s escape, the Council of Zulkirs immediately tried to repair the damage that the spymaster had inflicted on their cause. Around a week later, the mage-lords convened a council of war to decide on their next move. The zulkirs knew that Szass Tam was gathering his forces in and around Thralgard Keep in preparation for marching down the Third Escarpment and launching a new campaign, possibly against Eltabbar, but they were reluctant to engage the lich’s legions in a major battle.