History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
During the battle, the cavalry charged the left wing of the Athenians which was opposed to them, and routed it; and in consequence of this the rest of the army also was defeated by the Syracusans, and driven within their lines.