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For a century, archeologists have been looking for a gate through a wall built by the Vikings in northern Europe. This summer, it was found. Researchers now believe the extensive barrier was built to protect an important trading route.
Their attacks out of nowhere in rapid longboats have led many to call Vikings the inventors of the Blitzkrieg. "Like wild hornets," reads an ancient description, the Vikings would plunder monasteries and entire cities from Ireland to Spain.