The preparations of the Lacedaemonians from the first had been known to the Argives, who did not, however, take the field until the enemy was on his road to join the rest at Phlius. Reinforced by the Mantineans with their allies, and by three thousand Elean heavy infantry, they advanced and fell in with the Lacedaemonians at Methydrium in Arcadia. Each party took up its position upon a hill, and the Argives prepared to engage the Lacedaemonians while they were alone; but Agis eluded them by breaking up his camp in the night, and proceeded to join the rest of the allies at Phlius. The Argives discovering this at daybreak, marched first to Argos and then to the Nemean road, by which they expected the Lacedaemonians and their allies would come down. However, Agis, instead of taking this road as they expected, gave the Lacedaemonians, Arcadians, and Epidaurians their orders, and went along another difficult road, and descended into the plain of Argos. The Corinthians, Pellenians, and Phliasians marched by another steep road; while the Boeotians, Megarians, and Sicyonians had instructions to come down by the Nemean road where the Argives were posted, in order that if the enemy advanced into the plain against the troops of Agis, they might fall upon his rear with their cavalry. These dispositions concluded, Agis invaded the plain and began to ravage Saminthus and other places.