A missile from a Roman ballista, found at Leckie Broch (central Scotland). A crack in the stone is clearly visible, which scientists interpret as the result of a sudden change in temperature. Perhaps the stone was heated for the purpose of the attack, and the defending Picts tried to cool it with cold water.
Based on other finds in the area and the stratigraphic layer, researchers date the object to the middle of the 2nd century CE.
