1st round: knife, repair all windows but one
2nd round: shoot one clip then knife until empty then repeat round one
3rd round: if you were lucky enough to get max ammo then keep using pistol and knife if not
buy a gewer and shoot twice before kniving for maximum points.now open all the doors on your preferred side but do not jump down to the power instead buy either a thomson or m1a1 carbine and sit at the edge. this means if you get overrun you simply take a step back and you can create some space between you and zombies.
4th round: if you have an m1a1 carbine then swap that for a random weapon preferably a full automatic. you can choose to turn on power or not but if power turned on then just repeat round three minding that the bridge will be down

after all the stick ive got from the below users ive decided to point out the obvious...
keep going back to the ledge and repeating for the higher rounds for :idea: sake. :arrow: :arrow: