Defend the Factory is a mission of Call of Duty: Finest Hour. Tanya, along with her spotter, Aleksandr, and other Russian soldiers, defend a tractor factory against German forces while waiting for Nikolai's tank crew to arrive.
When the level starts, begin moving through the trench. Soon enough, mortar shells will start hitting the ground above you, so crouch and keep moving! When you get to the factory, go up the steps and head up to the walkway. Find a window that gives you a good view of the area and also provides good cover. Snipe the Germans one-by-one, paying special attention to the soldiers carrying Panzerschrecks or MG42s. Keep sniping until Pvt. Sokolov tells you to cover the right side of the area, and move to a new window. Keep sniping until you need to move again, rinse and repeat. After a while, a tank will show up; get away from the windows, and get to the ground floor. The commissar will open the large doors, allowing you to eliminate the Germans attacking the tank crew. Once the tank crew enters the factory, heal the soldier with a med kit, and get on the tank to end the level.
Try to find a window that allows you to go prone, while still providing cover; you are more accurate while prone, but will be unable to move while reloading.
If you run out of ammo for your sniper rifle, there's more at either end of the walkway.
Make the soldiers with Pansershrecks your top-priority targets; if they get close enough, they will blow open the side doors of the factory and start firing at the tank.
Sometimes, while defending one side of the factory, a machine gun crew will set up their gun on the opposite side, so be sure to check every now and again to avoid being shot from behind.
Listen carefully what Pvt. Sokolov says. He will report where the enemies are coming from.
Try to shoot the MG teams until they manage to deploy the weapon; otherwise soldiers will be able to just go and shoot from it without needing a team to go all the way to a position and deploy a machine gun.
It is impossible to stop the machine gunner from shooting the tank crew member at the end of the level; the machine gun fires from inside a building and has no gunner.
Even after the tank crew arrives and Nikolai orders everyone to get on the tank, the commissar will remain in the factory.
The machine gun crews consist of two soldiers: one carrying a tri-pod, and the other carrying the actual gun, but the soldier that is supposed to be carrying the tri-pod is actually empty-handed, but is still running as if he is carrying something on his shoulder.