History of the Peloponnesian War

The Argives, having had notice both formerly of the preparation of the Lacedaemonians and afterward of their marching on to join with the rest at Phlius, brought their army likewise into the field. They had with them the aids of the Mantineans and their confederates and three thousand men of arms of the Eleians;

and marching forward, met the Lacedaemonians at Methydrium, a town of Arcadia, each side seizing on a hill. And the Argives prepared to give battle to the Lacedaemonians whilst they were single. But Agis, dislodging his army by night, marched on to Phlius to the rest of the confederates, unseen.