History of the Peloponnesian War

By thus exhorting the Boeotians, Pagondas persuaded them to go against the Athenians, and quickly breaking up his camp, led the army forward (for it was now late in the day). On approaching near to their forces, he placed his troops in a position where, in consequence of a hill intervening, the armies did not see each other;

and there he drew them up, and made his arrangements for battle. When Hippocrates, who was still at Delium, received tidings of the advance of the Boeotians, he sent to his troops, with orders to throw themselves into line, and himself joined them soon after, leaving three hundred horse at Delium, both to defend it if any one came against it, and to watch their opportunity and fall upon the Boeotians during the engagement.