Are these sentences correctly worded?

FYI- Sylora's force in the Ashmadai and zombies. Sylora then assembled a small contingent of her forces to attack Neverwinter. While Valindra led Sylora’s minions in assaulting the city, Sylora and Jestry visited Arunika, who promised them the assistance of the Abolethic Sovereignty. During the attack on Neverwinter, Barrabus fought alongside the city’s citizens and inflicted considerable casualties on the enemy. At a predetermined time, Alegni led the Shadovar forces into the battle and easily defeated the horde of Ashmadai and zombies.