Objective 4 : Find the secret communications room.

First things first, retrace your steps back to the ground floor. As you approach the hallway with those big double doors, get ready. They're about to burst open, and two German soldiers will be waiting to open fire. Make sure you've got your BAR ready to take them down quickly.

Once they're dealt with, switch to your Iron Sights and move forward cautiously. Keep an eye on the upper right corner of the door ahead – you'll spot two more Germans on a balcony. Inch forward just enough so you can get a clear shot at their torsos and take them out. They should tumble over the railing, but if for some reason they don't, well, you know what to do.

The Chateau's layout is pretty straightforward, so finding the comms room shouldn't be a headache. When you enter the next room, immediately duck behind one of the pillars and crouch down. Pull out your Thompson and get ready for some Germans who will come running in from near the staircase.

After clearing them out, head up the stairs and move down the hallway. Keep your weapon up and shoot any Germans that rush towards you.

When you reach the end of this hallway, stop at the door. Lean out carefully with your BAR and take out the three enemies positioned on the balcony. After that, keep your head exposed just long enough to deal with the German who's shooting at you from behind the next doorframe. Try for a headshot, but if you miss, a well-placed grenade should do the trick.

Keep pushing forward until you find yourself in a room that has a fireplace and a medium-sized table. Look for a bust of an eagle sitting on a wooden stand. Walk up to it and press the 'F' button to interact with it. This will rotate the bust and reveal a secret doorway leading to the comms room.