The Cisalpine Celts have remained a threat…
295 BCE
The Cisalpine Celts have remained a threat to Rome until their final defeat in 295, when a Roman army under Quintus Fabius Maximus Rullianus and Publius Decius Mus (son of the hero of the Latin War) crushes a united force of Samnites, Umbrians, Etruscans, and Gauls at Sentinum (present Sassoferrato).
Decius, like his father, had deliberately sacrificed his life during the battle to rally his men to victory.
All but the Samnites make peace with Rome.