Welcome to London.

Unfortunately this is a Bad Time.

You see, the undead SS forces known as the Letztes Bataillon happen to
be dropping in from airships along with a number of bombs at the
moment. Meanwhile, one Bishop Maxwell is assembling a force of modern
day Crusaders alongside his own Order to rescue Britain from the
Vampires and Heresy alike. Leading the forces of the Crown at the
moment are the remains of the Royal Order of Protestant Knights, better
known these days as the Hellsing Organisation.

In the midst of this three-sided conflict, with no warning whatsoever,
are summarily dumped: