History of the Peloponnesian War

Under Demosthenes' direction they were divided into companies of two hundred more or less, which occupied the highest points of the island, in order that the enemy, being surrounded on all sides, might be in the greatest possible perplexity and not know which attack to face, but be exposed to missiles on every side from the host of their opponents—if they attacked those in front, from those behind; if those on either flank, from those arrayed on the other.

And they would always find in their rear, whichever way they moved, the light-armed troops of the enemy, which were the most difficult to deal with, since they fought at long range with arrows, javelins, stones, and slings. Nay, they could not even get at them, for they were victorious even as they fled, and as soon as their pursuers turned they were hard upon them again. Such was the idea which Demosthenes had in mind when he devised the plan of landing, and such were his tactics when he put this into effect.