The rules of engagement are clear when facing another army, but they are useless against a more primal foe. From the African plains to the mangrove swamps of Burma, soldiers discovered that the greatest danger wasn't the enemy in the opposite trench, but the man-eaters that saw both sides as nothing more than prey.

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On the frozen battlefields of the Korean War, American soldiers faced down the overwhelming force of the Chinese army. But for one company of infantrymen, the true enemy was not human; it was a silent, glowing orb that toyed with their artillery before unleashing a terrifying weapon of its own.

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For the people of 16th-century Europe, the sky was a place of divine mystery, not a battlefield for mortal men. But in 1566, the heavens over Basel, Switzerland, became just that, as hundreds of dark spheres waged a mysterious war before the eyes of the citizens below.

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