Lerna Heracles killed it, as the second of his labors. The strong Karstic springs remained; the lake, diminished to a silt lagoon by the 19th century, has vanished. Lerna is notable for several archaeological sites, including an Early Bronze Age structure known as House of the Tiles, dating to the Early Helladic period II (2500–2300 BC). The secret of the Lernaean spring was the gift of Poseidon when he lay with the "blameless" daughter of Danaus, Amymone. The geographer Strabo attests that the Lernaean waters were considered healing: Lake Lerna, the scene of the story of the Hydra, lies in Argeia
Battle of the Lerna Mills Phillips places the number at 250). Prince Demetrios Ypsilantis and several philhellenes volunteered in the defense of the garrison. Protecting Lerna was vital since the mills contained large quantities of grain that supplied food to Nafplion. The mills of Lerna were surrounded by a stone wall that was flanked by a deep pond and a marsh. Moreover, the garrison was supported by two gunboats that were anchored a short distance (or "musket-shot distance") from the shore. Unfortunately, the Greeks did not repair a small break in the stone wall. As a result, a small contingent of Arabs exploited this weakness