History of the Peloponnesian War

They made ladders equal in height to the enemy's wall, getting the measure by counting the layers of bricks at a point where the enemy's wall on the side facing Plataea happened not to have been plastered over. Many counted the layers at the same time, and while some were sure to make a mistake, the majority were likely to hit the true count, especially since they counted time and again, and, besides, were at no great distance, and the part of the wall they wished to see was easily visible.

The measurement of the ladders, then, they got at in this way, reckoning the measure from the thickness of the bricks.

The wall of the Peloponnesians was built in the following fashion. It had two encircling lines, the inner looking towards Plataea, the outer to guard against attack from the direction of Athens, and the two circuits were distant about sixteen feet from one another.

This interval of sixteen feet had in building been divided up into rooms assigned to the guards; and the whole structure was continuous[*](ie. the two περίβολοι were joined together by a roof.), so as to appear to be a single thick wall furnished with battlements on both sides.

And at every tenth battlement there were high towers of the same width as the wall, extending both to the inner and outer faces of it, so that there was no passage left at the sides of the towers, but the guards had to go through the middle of them.

Now at night when the weather was rainy the guards left the battlements and kept watch from the towers, which were not far apart and were roofed overhead. Such, then, was the wall by which the Plataeans were beleaguered.

After the Plataeans had finished their preparations, they waited for a night that was stormy with rain and wind and at the same time moonless, and then went forth. They were led by the men who were the authors of the enterprise. First they crossed the ditch which surrounded the town, then reached the foot of the enemy's wall unobserved by the guards, who in the all-pervading darkness could not see ahead and could not hear because the clatter of the wind drowned the noise of their approach;