Is this little passage all worded and structured in the best way?

In 574 PC, the War of Bones occurred when a Black-Robed wizard named Salius Ruven raised an undead army and attacked Istar. After the undead forces defeated and scattered the imperial legions of the empire, Ruven sent them to besiege the Lordcity itself. During that time, Lannis the Blind, the Emperor of Istar, sent Eldan, the First Son of the Istaran Church, to ask the wizards of the Tower for help, but they refused to fight one of their own.