So when Darius assaulted the whole circuit of the walls, according to the agreed plan, then Zopyrus' treason was fully revealed. For while the townsmen were on the wall defending it against Darius' assault, he opened the gates called Cissian and Belian, and let the Persians inside the walls.
Histories. Herodotus. ed. A.D. Godley. Cambridge. 1920-1925.
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