After the overthrow of the Roman monarchy in 509 BC, the exile of the royal family and the king Lucius Tarquinius Superbus, and the establishment of the Roman Republic, Tarquinius sought military aid to regain the throne from the Etruscan king of Clusium, Lars Porsena. Porsena led his army against Rome in 508 BC. The battle went badly for the Romans, and the Etruscan army surged towards the bridge. The Romans initially fell back. However, Horatius, with the assistance of Spurius Lartius and Titus Herminius Aquilinus, sought to buy time and halt the attack by defending the opposite end of the bridge while the Roman soldiers broke the bridge.