History of the Peloponnesian War

Encamping in Eleusis and the Thriasian plain, they began their ravages, and putting to flight some Athenian horse at a place called Rheiti, or the Brooks, they then advanced, keeping Mount Aegaleus on their right, through Cropia, until they reached Acharnae, the largest of the Athenian demes or townships. Sitting down before it, they formed a camp there, and continued their ravages for a long while.

The reason why Archidamus remained in order of battle at Acharnae during this incursion, instead of descending into the plain, is said to have been this.

He hoped that the Athenians might possibly be tempted by the multitude of their youth and the unprecedented efficiency of their service to come out to battle and attempt to stop the devastation of their lands.