Battle of Cape Ecnomus (256 BC): A Giant Naval Clash of Antiquity

The Battle of Cape Ecnomus was a naval battle fought in the summer of 256 BC off the southern coast of Sicily, between a Roman fleet carrying an invasion army to Africa and the Carthaginian fleet sent to stop it. If the figures given by the historian Polybius are close to the truth, nearly 300,000 men took part, making it one of the largest sea battles in history. The Roman victory opened the way for the first Roman invasion of Africa during the First Punic War.

Background

After their first naval success at the Battle of Mylae in 260 BC, the Romans were still unable to finish the war in Sicily, where Carthage held strong fortresses in the west. In 256 BC they decided to strike at Carthage directly by landing an army in North Africa.

The two consuls of the year, Marcus Atilius Regulus and Lucius Manlius Vulso Longus, sailed from Messana along the east and south coasts of Sicily and embarked picked troops from the legions. Carthage, warned of the plan, gathered its fleet at Heraclea Minoa under two commanders, Hamilcar and Hanno.

The fleets

Polybius states that the Roman fleet had 330 decked warships, each carrying about 300 rowers and 120 marines, giving around 140,000 men. He puts the Carthaginian fleet at 350 ships with more than 150,000 men. Some modern historians, beginning with W. W. Tarn in 1907, argued that these numbers are inflated, while others, including J. F. Lazenby, think they are broadly plausible.

The Romans formed four squadrons. The first two, under the consuls in their flagships, sailed in a wedge with the leading ships at the point. The third squadron towed the horse transports and closed the wedge at its base, and the fourth, called the triarii after the veteran line of a Roman army, followed behind as a rearguard.

The battle

The Carthaginians spread out in a long line, with their left wing close to the shore. Hamilcar, in the centre, ordered his ships to fall back as the Roman wedge advanced. The two leading Roman squadrons pursued, and the Roman formation split apart.

Three separate battles followed. Hanno’s right wing swung around to attack the Roman rearguard, while the Carthaginian left attacked the third squadron with the horse transports, pinning it against the coast. Meanwhile the consuls’ squadrons fought Hamilcar’s centre, where the corvus boarding bridges let the Roman marines board enemy ships.

Hamilcar’s centre broke first. Manlius stayed to secure captured ships while Regulus turned back to help the rearguard, and the two consuls then rescued the squadron trapped against the shore. Polybius records that the Romans lost 24 ships sunk and none captured, while the Carthaginians had more than 30 ships sunk and 64 captured.

Consequences

The Romans returned to Sicily to repair their ships and then crossed to Africa, landing near Aspis (Clupea) on the Cape Bon peninsula. They captured the town and plundered the countryside. The Senate then recalled Manlius with most of the fleet and the many prisoners, leaving Regulus with about 15,000 infantry and 500 cavalry.

Regulus beat a Carthaginian army at Adys, but in 255 BC he was defeated and captured near Tunis by an army retrained by the Spartan mercenary Xanthippus. The fleet sent to evacuate the survivors was largely destroyed in a storm off Camarina. The victory at Ecnomus thus led to one of Rome’s worst setbacks of the war, which ended only with the Battle of the Aegates Islands in 241 BC.

Key people

• Marcus Atilius Regulus: consul in 256 BC, who led the Roman landing in Africa and became, in later Roman tradition, a model of honour in captivity.
• Lucius Manlius Vulso Longus: his fellow consul, who commanded one of the two leading squadrons and returned to Rome with the prisoners.
• Hamilcar: Carthaginian commander of the centre, who planned the feigned withdrawal. He is not the same man as Hamilcar Barca, who took command in Sicily in 247 BC.
• Hanno: commander of the Carthaginian right wing, who attacked the Roman rearguard.

Why the Romans won

The Carthaginian plan was clever. By drawing the leading Roman squadrons away, Hamilcar hoped to isolate the slower rear squadrons, which were encumbered by the horse transports, and destroy them before help arrived. The plan failed because the centre gave way too quickly, before the wings had finished their work.

Roman discipline also mattered. The Roman ships were heavier and less agile, but the formation kept them together long enough for the consuls to turn back and support each other. Once ships were locked together by the corvus, Carthaginian skill in rowing and ramming counted for little against Roman marines.

By the numbers

Timeline

• 260 BC: Rome’s first naval victory at Mylae.
• 256 BC, summer: Roman fleet sails from Messana along the Sicilian coast.
• 256 BC: Romans defeat the Carthaginian fleet off Cape Ecnomus.
• 256 BC: Romans land at Aspis in Africa; Manlius is recalled to Rome.
• 255 BC: Regulus is defeated and captured near Tunis.
• 255 BC: Roman fleet wrecked by a storm off Camarina.

Why it matters

Ecnomus showed how far Rome had come in only four years at sea: a disciplined formation and the corvus beat the most experienced navy in the western Mediterranean. It also showed the limits of naval victory, because the invasion it made possible ended in disaster on land and at sea.