You're then only survivor soldier of the army. Get to the top of the tower and take the control of the gun. Shoot all the soldiers and helicopters to destroy them.
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Use the mouse to move the gun and click to shoot. Exterminate the helicopters and the enemy soldiers. If you succeed, you'll get points to buy ammunitions; click on "Buy" to buy the weapons. Don't let the enemies get to the tower or your energy will decrease and you'll lose.