In southern Belgium in 57 BC, the expansionist Romans under Julius Caesar fought against a confederation of several tribes of Belgian Gauls in the Battle of the Sabis. The Romans dealt a severe punishment to one Gallic tribe called the Nervii, forcing them to retreat. Three years later, the regenerated Nervii mounted an attack of their own against the 11th Claudian Legion of the Roman army led by Quintus Cicero, who had camped for the winter. The Nervii, using tactics they had learned from the Romans themselves, built a ten-mile circular wall and ditch around the Roman palisade, trapping the 11th within their own fortification. Before long, the Nervii assaulted the Roman position with towers, grappling hooks, and manpower, and the siege was on.