, 1651 The siege of Candia began in May 1648. The Ottomans spent three months laying siege to the city, cutting off the water supply, and disrupting Venice's sea lanes to the city. They would bombard the city for the next 16 years to little effect. The Venetians, in turn, sought to
blockade the Ottoman-held
Dardanelles to prevent the resupply of the Ottoman expeditionary force on Crete. This effort led to a series of
naval actions. On 21 June 1655 and 26 August 1656, the Venetians were victorious, although the Venetian commander,
Lorenzo Marcello, was killed in the latter engagement. However, on 17–19 July 1657, the Ottoman navy soundly defeated the Venetians. The Venetian captain,
Lazzaro Mocenigo, was killed by a falling mast. Venice received more aid from other western European states after the 7 November 1659
Treaty of the Pyrenees and the consequent peace between
France and
Spain. However, the
Peace of Vasvár (August 1664) released additional Ottoman forces for action against the Venetians in Candia. In 1666, a Venetian attempt to recapture La Canea failed. The following year, Colonel Andrea Barozzi, a Venetian
military engineer, defected to the Ottomans and gave them information on weak spots in
Candia's fortifications. On 24 July 1669, a French land/sea expedition under
Francois de Beaufort not only failed to lift the siege, but also lost the fleet's vice-flagship
La Thérèse, a 900-ton French warship armed with 58 cannons, to an accidental explosion. This dual disaster was devastating to the morale of the city's defenders. , 1863. Chastened by their failed relief effort and the loss of so valuable a warship, the French abandoned Candia in August 1669, leaving
Captain General
Francesco Morosini, the commander of Venetian forces, with only 3,600 fit men and scant supplies to defend the fortress. He, therefore, accepted terms and surrendered to
Ahmed Köprülü, the
Grand Vizier of the Ottoman Empire on 27 September 1669. However, his surrender without first receiving authorization from the Venetian
Senate made Morosini a controversial figure in Venice for some years afterward. As part of the surrender terms, all Christians were allowed to leave Candia with whatever they could carry. At the same time, Venice retained possession of
Gramvousa,
Souda and
Spinalonga, fortified islands that shielded natural harbors where Venetian ships could stop during their voyages to the eastern Mediterranean. After Candia's fall, the Venetians somewhat offset their defeat by expanding their holdings in
Dalmatia. == Proposed biological warfare attack ==