For this mission you will switch between Hudson's ground squad and a spy plane that will help support the unit. While in the plane, single the ground troops to a safe house. Returning back as Hudson, the Russian forces will attack with Flashbangs and other means of deadly force. Allow Weaver to help you out and cream the enemies.
You'll be back in the pilot seat and will be able to order your team across the backlines. Spot to order them to kill the enemies up the hill and move to the next point. When a huge mass of enemies approach, order the troops to dig into the ground. Once the area is clear, order your men to enter barracks.
Take down the enemies and arm up a bomb. Destroy the stronghold and move to the next area. Repel down the building and be sure to break and avoid falling to your death.
Now, bust through the windows and kill off the enemies inside while the game chugs down. Sneak behind the next set of enemies and kill them off with silent head shots.
You will come to the main base and the guards will be none the wiser. You have some options, including sneaking by or getting in some quick melee or sniper kills. Shoot out the doors to the main building and enter the insides.
Shoot down the enemies on the lower levels and move down. Find the radar dish controls and blow a hole in them, disabling them forever.
An avalanche will start up and you'll need to get away. Run an absurd distance and jump off the side ledges. Use the buttons on screen to deploy your parachute and land safely.
Finally, you'll be attacked by one last swarm of enemies. You only have a small amount of time, so use your grenades to break up the enemies fast. Dash to the truck outside and let Weaver stroll you to the end of the mission.