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In page Umbria:

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After the downfall of the Etruscans, Umbrians aided the Samnites in their struggle against Rome (308 BC). Later communications with Samnium were impeded by the Roman fortress of Narnia (founded 229 BC on the place of the umbrian Nequinum, conquered in 299 BC).[7][8][4] Romans defeated the Samnites and their Gallic allies in the battle of Sentinum (295 BC).[8] Allied Umbrians and Etruscans had to return home and defend each of their territories against simultaneous Roman attacks, leaving the Samnites without their help at Sentinum.[citation needed]