A1: You have to use stealth and the silenced pistol to take out any soldiers you might meet on your way to rendezvous with your contact. If you're spotted, they phone and warn Bormann. The place to hide is under the truck, after placing TNT near the half track. Don't shoot the TNT until Bormann's jeep arrives.

TIP - On your stealthy way to the hole in the wall, place a trip mine in the doorway opposite, where the other officer emerges from later. You will blow him to bits and be able to concentrate on Bormann.