It really easy you just have to watch out for the sniper on top.
1. Go to the edge near the bridge
2. <Important> You have to stand up and then jump + crouch when you trying to get on the edge.
3. Slowly move up to the middle of the side.
4. Kick some zombie ass.
[IMG]https://i1227.photobucke*****m/albums/ee435/chubedethuong/Crossfire20111227_0001.jpg[/IMG]
Sorry for the lag. xD
and here is the other side of the bridge glitch - https://www.mpgh.net/forum/212-crossf...ce-glitch.html (But it sometimes causes error.)