The Hospitallers continued their actions against the Muslims and especially the Barbary pirates. Although they had only a few ships they quickly drew the ire of the Ottomans, who were unhappy to see the order resettled. In July 1551, Ottoman forces attempted to take over Fort Saint Angelo and later Mdina but saw that they were outnumbered and invaded Gozo several days later. They sailed to Tripoli and captured the city in August. Following these attacks, the Order tried to repopulate Gozo and strengthen the Grand Harbour fortifications. Several forts including Saint Elmo and Saint Michael were built, and the city of Senglea began to develop around the latter fort.