Hostilities in Sicily resumed in 252, with the taking of Thermae by Rome. Carthage countered the following year, by besieging Lucius Caecilius Metellus, who held Panormos (now Palermo). The consul had dug trenches to counter the elephants, which once hurt by missiles turned back on their own army, resulting in a great victory for Metellus, who exhibited some captured beasts in the Circus. Rome then besieged the last Carthaginian strongholds in Sicily, Lilybaeum and Drepana, but these cities were impregnable by land. Publius Claudius Pulcher, the consul of 249, recklessly tried to take the latter from the sea, but he suffered a terrible defeat; his colleague Lucius Junius Pullus likewise lost his fleet off Lilybaeum. Without the "corvus", Roman warships had lost their advantage. By now, both sides were drained and could not undertake large scale operations; the number of Roman citizens who were being called up for war had been reduced by 17% in two decades, a result of the massive bloodshed. The only military activity during this period was the landing in Sicily of Hamilcar Barca in 247, who harassed the Romans with a mercenary army from a citadel he built on Mt. Eryx.