The accounts of the war include a number of matters directly concerning Porsena. One story is that during Porsena's siege of Rome, a Roman youth called
Gaius Mucius with the approval of the senate sneaked into the Etruscan camp with the intent of assassinating Porsena. However, when Mucius came close to the king, he could not tell apart the king from his secretary, and killed the king's secretary in error. Mucius was captured by the Etruscans, and brought before Porsena. He openly declared his identity and what had been his intent. He threatened that he was but merely the first of three hundred Roman youths who would attempt such a deed. To prove his valour, Mucius thrust his hand into one of the Etruscan camp fires, thereby earning for himself and his descendants the cognomen Scaevola. Porsena was shocked at the attempt, and dismissed Mucius from the camp. According to Livy, it was immediately after this event that the king sought peace by treaty.
