Objective 4 : Find the secret communications room.

First things first, head back down to the ground floor. As soon as you reach the hallway with those big double doors, get your finger ready on the trigger. Those doors are about to burst open, and two German soldiers will be right there, guns blazing. Take them out quickly with your BAR.

Once they're down, 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 both out. If for some reason one of them doesn't fall over the railing, well, you know what to do.

The Chateau doesn't really have any confusing paths, so finding the comm room shouldn't be a problem. When you enter the next room, duck behind one of the pillars. Get low and pull out your Thompson. Enemies will start running into the room from near the staircase – deal with them.

After clearing that room, head up the stairs and move down the hallway. Keep shooting any Germans that decide to run towards you.

When you get to the end of the hallway, stop right at the door. Lean out carefully with your BAR. You'll see three enemies on a balcony – take them out. Keep your head out and aim for the German who's shooting at you from behind the next doorframe. Try for a headshot; if you miss, a well-placed grenade should do the trick.

Keep moving forward. You'll soon enter a room with a fireplace and a decent-sized table. Look for a bust of an eagle on a wooden stand. Go up to it and press the 'F' button. This will rotate the bust and reveal the secret doorway leading to the comm room.