Turtle WoW

Just had a couple hordies spend 20 minutes or so turtling on their roof in Warsong Gulch...I don't even know HOW you get on the roof? Anyone want to tell me how to get up there? I assume it's some trick of jumping and terrain running, but I could be wrong.

You can get to roof from main tonnel. If you run from horde flag, turn left inside the tonnel. You will find slope leading to the roof there.