History of the Peloponnesian War

The town stands further off than the passage of the river, and the walls did not reach down to it as they do now, but there was only a small guard posted there; which Brasidas easily drove in, (partly from there being treason amongst them, and partly from the stormy weather and the suddenness of his attack,) and then crossed the bridge, and was at once master of all the property outside the town belonging to the Amphipolitans, who had houses over the whole quarter.

His passage having thus taken by surprise those who were in the city, while of those who were outside many were made prisoners, and others took refuge within the wall, the Amphipolitans were thrown into great confusion, especially as they were suspected by each other.