Soon after Magellan's expedition, the Portuguese rushed to seize the surviving crew and built a fort in Ternate. In 1525, Charles I of Spain sent another expedition westward to colonize the Maluku Islands, claiming that they were in his zone of the Treaty of Tordesillas. The fleet of seven ships and 450 men was led by García Jofre de Loaísa and included the most notable Spanish navigators: Juan Sebastián Elcano and Loaísa, who lost their lives then, and the young Andrés de Urdaneta.