and Sir Francis Drake was surprised by the Spanish, and several ships were captured or sunk at the Battle of San Juan de Ulúa near Veracruz in New Spain. This engagement soured Anglo-Spanish relations and in the following year the English detained several treasure ships sent by the Spanish to supply their army in the Netherlands. Drake and Hawkins intensified their privateering as a way to break the Spanish monopoly on Atlantic trade. Francis Drake went on a privateering voyage where he eventually circumnavigated the globe between 1577 and 1580. Spanish colonial ports were plundered and a number of ships were captured including the treasure galleon Nuestra Señora de la Concepción. When news of his exploits reached Europe, Elizabeth's relations with Philip continued to deteriorate. Soon after the Portuguese succession crisis of 1580, English support was provided to António, Prior of Crato who then fought in his struggle with Philip II for the Portuguese throne. Philip in return began to support the Catholic rebellion in Ireland against Elizabeth's religious reforms. Both Philip's and Elizabeth's attempts to support opposing factions were defeated. In 1584, Philip signed the Treaty of Joinville with the Catholic League of France to defeat the Huguenot forces in the French Wars of Religion. In the Spanish Netherlands, England had secretly supported the side of the Dutch Protestant United Provinces, who were fighting for independence from Spain. In 1584, the Prince of Orange had been assassinated, leaving a sense of alarm as well as a political vacuum. The following year was a further blow to the Dutch with the capture of Antwerp by Spanish forces led by Alexander Farnese, the Duke of Parma. The Dutch rebels sought help from England, which Elizabeth agreed to as she feared that a Spanish reconquest there would threaten England. The Treaty of Nonsuch was signed as a result – Elizabeth agreed to provide the Dutch with men, horses, and subsidies but she declined overall sovereignty. In return, the Dutch handed over four Cautionary Towns which were garrisoned by English troops. Philip took this to be an open declaration of war against his rule in the Netherlands. War The Anglo-Spanish War broke out in 1585, following the seizure of English merchant ships in Spanish harbors. In response the English privy council immediately authorised a campaign against the Spanish fishing industry in Newfoundland and off the Grand Banks. The campaign was a huge success,