Just run ahead and you'll trigger a flashback which is when the mission takes place. Once you land, watch for enemies coming out of the door and coming from the left side of the door. Make your way inside and you don't have to kill the first guy in the hallway but when you get into the office, four enemies will walk down the ramp that is your waypoint. Take them out and head up to the next floor. Move through this room to the back left, clearing as you go. Go up the stairs.
You'll come out on a rooftop and the only way forward is to vault over some sandbags. Hang back first and clear some enemies. Vault over and head to then corner. Go prone and swap weapons. Snipe the enemies on the far rooftop. After they are dead, the other squad will touch down on that roof and be attacked by a second wave of enemies. Support them from there. Once the roofs clear, they'll be attacked by a tank in the streets. Instead of just marking one spot with this, you actually need to mark two and she will hit everything in between.
Watch for a moment and then rappel down to the streets. Make your way through a building and out the other side. Head down a little ways and grab the RPG. Use that to destroy the tank. Wait for the German tank to come over the bridge and keep it to your left side. Watch to the right because you will be rushed ban enemy. Clear the enemies ahead and stick with the tanks. Move up to the lead tank.
When you are back on your feet, follow Sandman for a little while until you get back outside and see the hotel. You will have to get through a small group first but they'll rush forward leaving you with an elevation advantage. Make your way into the building, kill the enemies there and make your way down the stairs. When you hit the bottom landing, watch for enemies attacking from the right. Get rid of them or just head straight across the room to the door on the far side. Head up the stairs and make your way down the hallway. Breach the door and after the explosion, kill the two enemies with your hand gun.
