Thucydides - History of the Peloponnesian War (Quote Three)

"Thus, the majority of the native army gave up attacking the Hellens with Brasidas in the open country. Leaving a part of their force behind to follow up and harass his march, the rest ran ahead after the Macedonians who were in flight, killing all whom they overtook, and so reached and occupied, before Brasidas could get there, the narrow pass between two hills that leads into the coutnry of Arrhabaeus, knowing that this was the only route by which he could retreat. " (Thucydides 4.127)

Thucydides lived from est. 460 BC to 395 BC.