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|Battle of Castrum Viterbii|
|Campaign: Italian Theater of the Roman Civil War|
|Date: 202 BC|
|Place: present-day Viterbo, Italy|
|Outcome: Julii victory|
Years before the Julii attempted to take over Rome, the Brutii sent armies to the north, passing through Julii territory to head to Greece and to Asia Minor to fight the Thessalians, Egyptians, and Pontics. Some armies were marching through when the Julii were outlawed following their attempt to conquer the city of Rome, which succeeded. The Brutii diverted to besieging the northern Julii citites, causing panic within. After the fall of Rome, Sextus Julius marched north to engage these armies and save Arretium and Arminium.
The Roman army deployed their Hastati as their front lines, as they were the core of their infantry, while they also had some Auxilia and Legionnaire Cohort regiments at their disposal. They attacked Captain Gaius' Brutii army first, blocking it from linking up with the other regiments. The Julii then followed the same steps with the other armies, preventing them from linking up to form a larger army. The Julii suffered some casualties while holding the enemy back, as the Hastati were some of the poorest soldiers, but they carried the day, pushing the Brutii back. 2,260 Brutii were slain in the glorious victory, while 1,940 Julii soldiers were killed.