Voldemort had been vanquished hours before, but his supporters- and many of them are almost as terrible as he- were still at large, angry, desperate and violent.
And you can also use the passive where " Everton, they were blown out." So here, you use, " They were blown out" in the passive construction for Everton.
The group immediately decided to begin their attack but were quickly defeated by the Qing army The surviving members now without a leader, went their separate ways waiting for the time when they could rise again.