In 1658, Ottoman power was redirected north in a campaign against George II Rákóczi, Prince of Transylvania, which evolved into a long conflict with the Habsburgs. For the next few years, the Venetian fleet, again under the command of Morosini, unsuccessfully attempted to maintain the blockade of the Straits of the Dardanelles. Morosini also resumed his tactic of attacking Ottoman strongholds: a siege of the island of Santa Maura (Lefkada) in August 1658 failed, but in 1659, the Venetians, aided by the Maniots, sacked Kalamata in the Peloponnese, followed by Torone in the Chalcidice, Karystos in Euboea, and Çeşme. However, since Venice could not spare forces to occupy these places, these raids gained the Republic nothing of substance. On the Ottoman side, Köprülü Mehmed ordered the construction of two new forts, Sedd el Bahr ("Rampart of the Sea") and Kilid Bahr ("Key of the Sea"), at the European shore of the entrance of the Dardanelles, to prohibit the Venetians from entering the Straits again.