sentences:  In July 1551, the Ottomans attempted to take Malta but were deterred and so they attacked the sister island of Gozo, which capitulated after some days of fierce fighting.Nearly the entire population of the island were taken as slaves, including the governor Gelatian de Sessa and other knights.In August of that year, the Order suffered another blow when it lost its North African stronghold of Tripoli to an Ottoman force commanded by the famous corsair leader Dragut and the admiral Sinan in the Siege of Tripoli.