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How did Celtic tribes reach the Balkans and Anatolia during the 3rd century BCE?

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Sláinte: The influence of Irish language on English — Celtic languages Britannica editor Jeff Wallenfeldt provides an overview of the Irish language.

During the 3rd century BCE, Celtic tribes migrated across Europe and into the Balkans and Anatolia through a combination of independent raiding and strategic recruitment by local rulers.

In the Balkans, Celtic groups moved through Macedonia, with some tribes launching plundering expeditions into Greece, such as the 279 BCE campaign led by the chieftain Brennus, which famously targeted Delphi.123

Their arrival in Anatolia occurred in 278 BCE, when three Celtic tribes crossed the Dardanelles (or Bosporus) after being invited by Nicomedes I of Bithynia to serve as allies in a civil war. These groups, later known as Galatians, ravaged western Anatolia until they were defeated by the Seleucid king Antiochus I at the Elephant Battle in 275 BCE. Following this conflict, they settled in the region of northern Phrygia, which subsequently became known as Galatia.45