Italian archaeologists working in the city of Ugento uncovered sections of an extensive ancient defensive network intended to protect the city and its inhabitants from an advancing Roman army, The Kansas City Star reports. The wall was originally built in the fourth century b.c. but was significantly enhanced a century later, when its thickness grew to 20 feet wide. Near one of the corner bastions, the team encountered a destruction layer that contained 450 lead sling bullets and nine iron bolts fired from Roman scorpio machines, weapons that resembled large stationary crossbows. Researchers believe these are evidence of a Roman...