Events in a Nutshell:
Everyone knows Ebaumsworld has had a long history of stealing; if you didn't, now you do. Recently they have had fights with Something Awful, but when they stole from YTMND just recently it sparked off a large chain of events.
YTMND users, furious, asked for help. Luelinks, Something Awful, and many other sites gladly accepted.
Forces planned for an attack on 12 AM EST. Word quickly spread after the attack began; Knova and Newgrounds happily joined in (Ebaumsworld has made many people angry, it seems). 4Chan, busy in a separate invasion of another site, also joined in some part with the smackdown.
The ebaumsworld.com forums were mercilessly obliterated. At first, there was just heavy lag, until the database crashed. Eventually the forums came back up, but crashed again. When it arose the next time, it prevented anyone not logged into an account from even viewing the forums and began mass-banning any new users. They quickly went down again, this time fully- the forums subdomain temporarily shut down.
Sendell was a great troll and poster when he wasn't distracted by the vanity crowd. I miss him.