History of the Peloponnesian War

On his arrival then at this time in the countries Thrace-ward, the Athenians, when they heard it, declared war against Perdiccas, thinking that he was the cause of his march thither; and kept a closer watch over their allies in that quarter.

Perdiccas immediately took Brasidas and his army, and led them with his own forces against Arrhibaeus the son of Bromerus, king of the Lyncestian Macedonians, whose territory bordered on his own; for he had a quarrel with him, and wished to reduce him to subjection.

But when he had come with his army, accompanied by Brasidas, to the pass into Lyncus, Brasidas told him that he wished to go, before hostilities were commenced, and by means of words bring Arrhibaeus into alliance with the Lacedaemonians, if he could.