Stormwind Siege Preview
One of the features for the server is that if you gain enough resources you can mount a siege on the cities/zones controlled by the Scourge in an attempt to reclaim them. This video shows a preview of this. Expand the description to find out more.
This does not show the complete Stormwind siege and is still an early preview.
The website is: http://www.lightsdawn.net/
Again, I cannot reply to YouTube comments because I do not have a Google+ account.