When you walk into that part of the building there will be two glass windows in front of you and a lower of the building to your left. There is a jerry in that part of the building. If you look out the windows you will see a bombed out building with a machinegunner in it. I prefer to let the gunner shoot out the windows, then I frag him. After you kill that goon you should then look down to the left and kill the kraut there. Then you jump down and take the thompson to the left if you need ammo. To the right will be a door. You walk out the door and look left. There will be a machine gunner in the opening in the building. You have to frag him fast.
After you kill the machine-gunner go into the bar to your right. There will be 2 krauts and several bottles of bubbly, along with some packs of smokes. Now as you exit the bar walk straight forward and slightly to the left. You reach the big elevated hole-in-the-wall where you killed a machine gunner. Enter this elevated area, eventually you reach a door, open it and be careful, there is a kraut sniper the the right and up. Once you have disposed of him, go left, you will find a BAR in a closed off alley. turn around to exit the alley and go left there are 3 kraut soldiers and an officer when you round the big brick building. Kill them then shoot the window on the building in front of you, the glass will break. Enter the building through the window. Walk straight and then duck behind the half-wall. There is a crapload of krauts on the roof of the building in front of you. Take your time to take them out.
Now you advance to the building and veer to the left to a narrow corridor. At the end of the corridor is another corridor on the left which is mined. Use grenades to clear the corridor and proceed along it's length, then turn left. There will be krauts on your right (with a MG) and straight ahead. Take them out but be careful of the MG. Turn right and walk, you will come to an opening in between buildings walk in to it and eventually you will find the freindly's foxhole.