Thucydides, History of the Peloponnesian War
Benjamin Jowett, Ed.

123. In the meantime Mendè, a city of Pallenè and an Eretrian colony, revolted from them.¹ Brasidas felt justified in receiving the Mendaeans, although, when they came to him, the peace had unmistakably been declared, because there were certain points in which he too charged the Athenians with violating the treaty. [2] His attitude encouraged them to take this bold step; they saw his zeal in the cause, which they likewise inferred from his unwillingness to hand over Scionè to the Athenians. Moreover the persons who negotiated with him were few in number, and having once begun, would not give up their purpose. For they feared the consequences of detection, and therefore compelled the multitude to act contrary to their own wishes. [3] When the Athenians heard of the revolt they were more angry than ever, and made preparations against both cities. [4] Brasidas, in expectation of their attack, conveyed away the wives and children of the Scionaeans² and Mendaeans to Olynthus in Chalcidicè, and sent over five hundred Peloponnesian hoplites and three hundred Chalcidian targeteers, under the sole command of Polydamidas, to their aid. The two cities concerted measures for their defence against the Athenians, who were expected shortly to arrive.