The Battle of Fidentia took place in September of 82 BC at Fidentia during the context of Sulla's Second Civil War. The battle pitted the Optimates under the command of Marcus Terentius Varro Lucullus against the Populares forces commanded by Lucius Quincius. The battle resulted in a decisive Optimate victory.
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Text from the Wikipedia article “Battle of Fidentia”, available under CC BY-SA 4.0.