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
Greek ironclad Hydra 1897–1900, "Hydra" and her sister-ships were partially rearmed; "Hydra" was modified at the La Seyne shipyard. Their small-caliber guns were replaced with one gun forward, eight guns, four 3-pounders, and ten 1-pounder revolver cannon. One of the 14-inch torpedo tubes was replaced with a weapon. In 1908–1910, the old 5.9 in guns were replaced with new, longer L/45 models. The Balkan League, of which Greece was a member, declared war on the Ottoman Empire in October 1912. Two months later, the Ottoman fleet attacked the Greek navy, in an attempt to disrupt the naval blockade surrounding the Dardanelles. The Ottoman