Uncanny X-Men Vol 1 #510

SIEGE!

The Sisterhood executes a massive raid on the Graymalkin Facility, taking their fight to the Uncanny X-Men, and you won't believe the ferocity. No one is safe! Everybody fights! But why? How? What do they want? And how long can violence at such an insane level last? Oh, about most of the issue.Oh, things are getting ugly.