History of the Peloponnesian War

At the close of the same winter, in fact almost in spring, Brasidas made an attempt upon Potidaea. He arrived by night, and succeeded in planting a ladder against the wall without being discovered, the ladder being planted just in the interval between the passing round of the bell and the return of the man who brought it back. Upon the garrison, however, taking the alarm immediately afterwards, before his men came up, he quickly led off his troops, without waiting until it was day.

So ended the winter and the ninth year of this war of which Thucydides is the historian.