History of Portugal (1640–1777) put to the test in 1762 when Spain invaded aided by France, during the Seven Years' War. Britain invoked its alliance with Portugal and sent troops. Several months later, the conflict was settled with comparatively little fighting. In 1777, Spain and Portugal signed the Treaty of San Ildefonso, which mainly resolved a number of border disputes between their South American colonies. During the Age of Enlightenment, Portugal was considered one of Europe's unenlightened backwaters; it was a country of three million with 200,000 people in 538 monasteries in 1750. Melo seems to have been deeply embarrassed by Portugal's much lamented
Portugal Working Equitation Championship. In water sports, Portugal has three major sports: swimming, water polo and surfing. The country also annually hosts one of the stages of the World Surf League Men's "Championship Tour", the MEO Rip Curl Pro Portugal in the Supertubos beach in Peniche. Northern Portugal has its own original martial art, "Jogo do Pau", in which the fighters use staffs to confront one or several opponents. Other popular sport-related recreational outdoor activities with thousands of enthusiasts nationwide include airsoft, fishing, golf, hiking, hunting and orienteering. Portugal is one of the world's best golf destinations. It has received several