History of the Peloponnesian War

The Athenians ravaged, too, during the same winter a part of Macedonia also, charging Perdiccas with the league he had entered into with the Argives and Lacedaemonians; and with the fact, that when they had prepared to lead an army against the Thrace-ward Chalcidians and Amphipolis, under the command of Nicias son of Niceratus, he had proved false to his allies, and the armament was chiefly broken up in consequence of his having deserted the cause. He was therefore proclaimed an enemy. And thus the winter ended, and the fifteenth year of the war.