Plot: European mercenaries searching for black powder become embroiled in the defense of the Great Wall of China against a horde of monstrous creatures. Storyline: When a mercenary warrior (Matt Damon) is imprisoned within the Great Wall, he discovers the mystery behind one of the greatest wonders of the world. As wave after wave of marauding beasts besiege the massive structure, his quest for fortune turns into a journey toward heroism as he joins a huge army of elite warriors to confront the unimaginable and seemingly unstoppable force. ImDb