In 1687, the Parthenon suffered its greatest blow when the Venetians attacked Athens. The Turks fortified the Acropolis and used the Parthenon temple as a gunpowder magazine. On 26 September a Venetian mortar, fired from the Hill of Philopappus, blew the magazine up and the building was partly destroyed. The internal structures were demolished, whatever was left of the roof collapsed, and some of the pillars, particularly on the southern side, were decapitated. The sculptures suffered heavily.