Title from web page. Andrew Tiernan, Mikko Leppilampi, Samuel Vauramo. Originally released as a motion picture in 2011.
Summary:
Captain Martin Stone is leading an elite platoon of Allied soldiers as they attack an enemy bunker. Underestimating their opponents' strength, they are quickly beaten back into the forest. As they try to regroup, they are suddenly attacked by the same soldiers they had just killed a few minutes earlier. Forced to flee deeper into Russian territory, they discover one of the war's most terrifying secrets and realize they have awakened a far deadlier enemy.
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