The second Battle of Lake Vadimo was fought in 283 BC between Rome and the combined forces of the Etruscans and the Gallic tribes of the Boii and the Senones.

According to Polybius, the battle followed events which started with the siege of Arretium (Arezzo, in north-eastern Tuscany).

The praetor Lucius Caecilius Metellus Denter died in the battle and was replaced by Manius Curius Dentatus.

[1] Polybius wrote that “[h]ereupon the Boii, seeing the Senones expelled from their territory, and fearing a like fate for themselves and their own land, implored the aid of the Etruscans and marched out in full force.

Appian wrote that “Britomaris, the Gaul, being incensed against them on account of his father, who had been killed by the Romans while fighting on the side of the Etruscans in this very war, slew the ambassadors” while they were still holding the herald’s staff.

He wrote that Britomaris wore their official garments and “cut their bodies in small pieces and scattered them in the fields."

Then Publius Cornelius Dolabella, (the consul for 283 BC) “while he was on the march, moved with great speed” to the ager Gallicus “by way of the Sabine country and Picenum” and laid it to waste: "He ravaged them all [the Senones] with fire and sword.

He reduced the women and children to slavery, killed all the adult males without exception, devastated the country in every possible way, and made it uninhabitable for anybody else."

The fact his father was killed by the Romans while fighting on the side of the Etruscans in the same war could suggest that this previous fighting was the battle of Lake Vadimon, which involved a combined Etruscan and Gallic army (the Battle of Arretium involved Gauls only).