Battle of Sentinum (295 BC): Rome Defeats Samnites and Gauls

The Battle of Sentinum, fought in 295 BC near modern Sassoferrato in central Italy, was the decisive Roman victory of the Third Samnite War. A Roman army under the consuls Quintus Fabius Maximus Rullianus and Publius Decius Mus defeated a combined force of Samnites and Gauls, the most dangerous coalition Rome had yet faced. The battle, remembered for Decius’s ritual self-sacrifice, confirmed Rome as the leading power in Italy.

Background: a coalition against Rome

The Samnite Wars had already lasted half a century when the third conflict began in 298 BC. Despite the humiliation of the Caudine Forks in 321 BC, Rome had won the second war, and by the 290s it was steadily encircling Samnium with colonies and alliances.

The Samnite leader Gellius Egnatius responded with a bold strategy. He led a Samnite army north to join forces with the Etruscans and Umbrians, and recruited the Senones, a Gallic people settled along the Adriatic coast. Gallic warriors had sacked Rome itself a century earlier, an event kept alive in Roman memory as the Gallic sack of Rome. The prospect of Samnites, Gauls, Etruscans and Umbrians acting together caused alarm in Rome.

Before the battle

Rome responded by mobilising on an unprecedented scale. The two consuls of 295 BC were veterans: Fabius Rullianus was consul for the fifth time and Decius Mus for the fourth. Livy says they led four legions with a large force of allied infantry and cavalry, and that other armies were stationed to protect Rome and the approaches.

A Roman advance force was mauled near Camerinum, but the consuls crossed the Apennines and found the enemy near Sentinum. According to Livy, the Romans learned of the coalition’s plans and ordered two reserve armies to ravage the territory of Clusium in Etruria. The Etruscans and Umbrians marched home to defend their lands, leaving the Samnites and Gauls to fight alone.

The battle

Livy places Fabius on the Roman right facing the Samnites, and Decius on the left facing the Gauls. Fabius held back, planning to wear the enemy down, while Decius attacked vigorously.

On the left the Gauls used war chariots, an unfamiliar sight to the Romans. Their noise and speed panicked the Roman cavalry and horses, and Decius’s wing began to collapse. At this point, Livy says, Decius imitated his father, who had died in the same way at the Battle of Vesuvius in 340 BC. He performed the devotio, a ritual vow offering himself and the enemy army to the gods of the underworld, and rode into the Gallic ranks, where he was killed.

His sacrifice is said to have rallied his troops. Fabius sent reinforcements to the left and, once the Samnites tired, launched his cavalry against their flank. The Samnites broke and fled to their camp, where Gellius Egnatius was killed. The Gauls, attacked from behind, were cut down in their tight formation.

Casualties

Livy reports 8,700 Roman dead, 7,000 of them from Decius’s wing, against 25,000 enemy killed and 8,000 captured. The Greek historian Duris of Samos, as reported by Diodorus Siculus, claimed 100,000 enemy dead, a figure no modern historian accepts. Even Livy’s numbers may be inflated, but Sentinum was clearly the largest battle fought in Italy up to that time.

Timeline

• 298 BC: The Third Samnite War begins.
• 296 BC: Gellius Egnatius leads a Samnite army north to form a coalition with Etruscans, Umbrians and Gauls.
• 295 BC: A Roman advance force is defeated near Camerinum.
• 295 BC: Battle of Sentinum; Decius Mus and Gellius Egnatius are killed.
• 293 BC: Roman victory over the Samnites at Aquilonia.
• 290 BC: The Samnites make peace with Rome.
• 283 BC: Rome defeats the Gauls and Etruscans at Lake Vadimo.

Consequences

Sentinum broke the coalition. The Etruscans and Umbrians soon made peace, and the Gauls withdrew. The Samnites fought on for five more years, but after defeat at Aquilonia in 293 BC and devastating campaigns by Manius Curius Dentatus they accepted Roman terms in 290 BC.

Within a few years Rome turned against the Senones, defeating them in 284-283 BC and founding a colony at Sena Gallica (Senigallia) on their land. By the time King Pyrrhus of Epirus arrived in 280 BC, Rome controlled almost all of central Italy.

Legacy

Polybius, writing in the 2nd century BC, already saw the defeat of the Gauls and Samnites as a key stage in Rome’s rise. Modern writers have sometimes called Sentinum the “Battle of the Nations” because of the many Italian peoples involved.

The self-sacrifice of the Decii, father and son, became one of Rome’s most famous patriotic stories. Some historians doubt that the son really repeated his father’s ritual and suspect the tale was shaped to match, but it shows how Romans later understood devotion to the state. The story inspired artists such as Peter Paul Rubens, whose Decius Mus tapestry designs of around 1616-1618 depict the elder Decius.

Why it matters

Sentinum ended the only serious attempt by Rome’s Italian enemies to unite against it. After 295 BC no coalition in Italy could seriously challenge Roman power.