The Histories · 7.211

and when the Medes were being roughly handled, then these retired from the battle, and the Persians, those namely whom the king called "Immortals," of whom Hydarnes was commander, took their place and came to the attack, supposing that they at least would easily overcome the enemy. When however these also engaged in combat with the Hellenes, they gained no more success than the Median troops but the same as they, seeing that they were fighting in a place with a narrow passage, using shorter spears than the Hellenes, and not being able to take advantage of their superior numbers. The Lacedemonians meanwhile were fighting in a memorable fashion, and besides other things of which they made display, being men perfectly skilled in fighting opposed to men who were unskilled, they would turn their backs to the enemy and make a pretence of taking to flight; and the Barbarians, seeing them thus…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
Source edition
Passage preview. Read in context for the complete text, notes and references.