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 was recognized by some of Ibrahim's shooters that remembered him from Neokastro. He was taken to the French frigate of Admiral De Rigny to be treated afterwards. He estimated the Egyptian losses to 500-600 dead and more wounded. Greek casualties were 2 dead and 2 wounded. In his account of the battle he praises all the defenders who "fought that day like lions" in a desperate struggle to repel Ibrahim and save Nafplion. Battle of the Lerna Mills The Battle of the Lerna Mills was fought on June 24, 1825 in Lerna, Greece between the Egyptian forces of Ibrahim Pasha