History of the Peloponnesian War

The town stood not close to the river, nor was there a fort at the bridge then as there is now; but they kept it only with a small guard of soldiers. Having easily forced this guard, both in respect of the treason and of the weather, and of his own unexpected approach, he passed the bridge and was presently master of whatsoever the Amphipolitans had that dwelt without.

Having thus suddenly passed the bridge, and many of those without being slain, and some fled into the city, the Amphipolitans were in very great confusion at it; and the rather because they were jealous one of another.

And it is said that if Brasidas had not sent out his army to take booty, but had marched presently to the city, he had in all likelihood taken it then. But so it was that he pitched there and fell upon those without;

and seeing nothing succeeded by those within, lay still upon the place.