The battle, of course, goes quite well for Tawny and her allies; between his eliminating some of their commanders, and the simple fact they're being led by someone so incredibly powerful, the Emperor's forces don't stand a chance. In fact, many surrender, and many more are merely removed from battle via non-lethal methods, and as such, only about ten percent of his forces were killed at all, especially with her ability to simply negate their defenses with a wave of her hand. In only a few hours, she captures the castle, seizes the Emperor, and lays claim to the throne, for herself.