(4.135) At the close of the same winter, towards the beginning of spring, Brasidas made an attempt on Potidaea. He approached the place by night and planted a ladder against the walls. Thus far he proceeded undiscovered; for the ladder was fixed at a point which the sentinel who was passing on the bell had just quitted, and before he had returned to his post. But Brasidas had not yet mounted the ladder when he was detected by the garrison: whereupon he withdrew his army in haste without waiting for the dawn. So the winter ended, and with it the ninth year in the Peloponnesian War of which Thucydides wrote the history.