But the Plataeans, observing the progress of the mound, constructed a wall of wood and fixed it upon that part of the city wall against which the mound was being erected, and built up bricks inside it which they took from the neighbouring houses.

The timbers served to bind the building together, and to prevent its becoming weak as it advanced in height; it had also a covering of skins and hides, which protected the woodwork against the attacks of burning missiles and allowed the men to work in safety.

Thus the wall was raised to a great height, and the mound opposite made no less rapid progress.

The Plataeans also thought of another expedient; they pulled out part of the wall upon which the mound abutted, and carried the earth into the city.
Discovering this the Peloponnesians twisted up clay in wattles of reed and threw it into the breach formed in the mound, in order to give it consistency and prevent its being carried away like the soil.

Stopped in this way the Plataeans changed their mode of operation, and digging a mine from the town calculated their way under the mound, and began to carry off its material as before.