 Complete the following phrase:  The invading Ottoman navy anchored at Marsaxlokk during the Great Siege of 1565, before they completed the attack on Fort Saint Elmo. The whole harbour area was systematically fortified over successive centuries, with towers, batteries and fortresses ringing Marsaxlokk bay. This chain of fortifications was intended to protect the vulnerable harbour, and included Vendôme Tower, Fort Delimara, Delimara Tower, Ta Bettina Tower, and Fort Tas-Silġ on Delimara point, on the north arm of Marsaxlokk Bay, Fort San Lucian on Kbira point in the middle of the bay, and the Pinto and Ferretti batteries on the shores of the bay towards Birżebbuġa. The most prominent fortification of this chain, Fort San Lucian was built by 1611 and may have prevented a landing in the bay by Ottoman forces in 1614. Napoleons navy entered Marsaxlokk, and landed an army on the coast during the 