Problem solved. If anyone has a problem with one missing artifact on the Battle on the bridge -level. There is 2 artifacts in the cave where the level starts. One is behind you to the right, you need bazooka or granadier to get there. And the other one is way way forward the tunnel. You need to run so the water cannot reach you and you'll find the artifact on the left side of the tunnel.
This was driving me nuts for hours so I hope this helps anyone in similar situation.
Last edited by ugli; 11-10-2011 at 12:20 AM.
Reason: solved the problem