secret army maintains and defends the Great Wall of China against a horde of monstrous creatures.

When a mercenary warrior (Matt Damon) is imprisoned in the Great Wall, he discovers the thriller at the back of one of the best wonders of the world. As wave after wave of marauding beasts besieges the big structure, his quest for fortune will become an adventure in the direction of heroism as he joins a big navy of elite warriors to confront the impossible and apparently unstoppable force.

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