History of the Peloponnesian War

Meanwhile his arrival in the Thracian country no sooner became known to the Athenians than they declared war against Perdiccas, whom they regarded as the author of the expedition, and kept a closer watch on their allies in that quarter.

Upon the arrival of Brasidas and his army, Perdiccas immediately started with them and with his own forces against Arrhabaeus, son of Bromerus king of the Lyncestian Macedonians, his neighbour, with whom he had a quarrel and whom he wished to subdue.

However, when he arrived with his army and Brasidas at the pass leading into Lyncus, Brasidas told him that before commencing hostilities he wished to go and try to persuade Arrhabaeus to become the ally of Lacedaemon,