History of the Peloponnesian War

So they set their hands to this task and went to work; they had no iron tools for working stone, but picked up stones and put them together just as they happened to fit; and where mortar was needed, for want of hods, they carried it on their backs, bending over in such a way as would make it stay on best, and clasping both hands behind them to prevent it from falling off.

And in every way they made haste that they might complete the fortification of the most vulnerable points before the Lacedaemonians came out against them; for the greater part of the place was so strong by nature that it had no need of a wall.