Mary Rose cannonballs early examples of armour-piercing rounds

The Mary Rose, the flagship of Henry VIII found on the ocean floor off the south coast of England, may once again change English history. Scientists studying cannonballs discovered on the ship have found them to be armor-piercing, a technology believed to have been created in the 18th century. (photos)

Experts have recently used state-of-the art imaging technology to show that the lead cannonballs held cube-shaped iron cores, allowing guns to "punch through the sides of enemy vessels," deforming the lead and throwing the iron against the sides of the ships.