The Gauls under Brennus were victorious, and advanced further into the Greek peninsula where they attempted to sack Delphi but were completely defeated.

Gallic groups, originating from the various La Tène chiefdoms, began a south-eastern movement into the Balkan peninsula from the 4th century BC.

The 279 BC invasion of Greece proper was preceded by a series of other military campaigns waged in the southern Balkans and against the kingdom of Macedonia, favoured by the state of confusion ensuing from the complex and divisive succession processes following Alexander's sudden death.

[6] Bolgios inflicted heavy losses on the Macedonians, whose young king, Ptolemy Keraunos, was captured and decapitated.

[8] The Gauls destroyed Kallion, on the border between Eurytania and Aetolia, but the resistance of the entire Aetolian population at the site of Kokkalia dealt a decisive blow to the Galatian threat.

Some of the survivors of the Greek campaign, led by Comontoris (one of Brennus' generals), settled in Thrace, founding a short-lived city-state named Tyle.

[9] Another group of Gauls, who split off from Brennus' army in 281 BC, were transported over to Asia Minor by Nicomedes I to help him defeat his brother and secure the throne of Bithynia.