Destroy the Siege Weapons!

Here is a picture that might come to help. It is taken when looking down onto the eastern part of Sra'vess.

http://localhostr.com/files/5YavojH/destroy-the-siege-weapons.jpg
A second mirror if localhostr is down: http://img833.imageshack.us/img833/7956/destroythesiegeweapons.jpg

Here are the locations for the four siege weapons:

Small Southern Siege Weapon - 27.54, 54.72
Large Southern Siege Weapon - 25.75, 53.59
Small Northern Siege Weapon - 26.03, 39.94
Large Northern Siege Weapon - 27.14, 41.23

Hint: Dont get stuck under the things when they respawn, you cant click on them and have to use your hearthstone to escape.