if i remember correctly, you start by sniping the guys across the bridge so they dont blow up the bridge, then the king tiger parks in the middle of the bridge. you then have to go the building on the right side of the street, because the high tower on the left gets blown up (don't be in it when it blows). the from the window in the right-side building you use the binoculars to see the incoming tanks and click fire to call for airstrike. be careful though, if you just sit with the binoculars, infantry close on your position, and will kill you if you aren't ready. have to switch between binos and gun of choice.