December 1659, the Courlanders peaceably surrendered their colony to the Dutch. At the time, the island held about 1,500 Europeans and around 7,000 African slaves working on 120 plantations, supporting six or seven sugar mills and two rum distilleries. British Jamaican pirates captured the island in January 1666; the official English garrison surrendered to a French attack in August the same year. The Dutch admiral Abraham Crijnssen reclaimed a deserted colony in April 1667 and reestablished a fort. An attempt to restore the Courish Fort Jacob was suppressed in December 1668. In December, 1672, the British attacked and destroyed the Dutch colony as part of the Third Anglo-Dutch War. Dutch control was regained under the status quo ante provisions of the Second Treaty of Westminster in 1674; in September 1676, Fort Sterreschans was constructed near the ruins of Fort Vlissingen. This star fort was reinforced in February 1677, but French attacks in February, March, and December of that year finally succeeded in killing the Dutch governor and capturing the island. In 1749, Britain and France agreed to keep the island neutral, but Britain took control after 1763, prompting France to capture the island in 1781, then Britain to recapture the island in 1793. The population in 1771 was 5,084, of which only 243 were white and 4,716 were slaves. In 1791 the population was 15,020, of which 541 were white and 14,170 were slaves. There were then 37 sugar factories, 99 cotton factories, and 4 coffee factories. After nutmeg was discovered in 1768, 40 nutmeg plantations were started. The island became a British acquisition for good in 1802, with a ratified treaty in 1814. Spanish missions in Trinidad Spanish missions were established as part of the Spanish colonization here as in its other new New World conquests. In 1687, the Catalan Capuchin friars were given responsibility for the conversion of the indigenous population of Trinidad and the Guianas. Tensions between priests and Amerindians led to the Arena Massacre of 1699, wherein the Amerindians murdered the priests. After being hunted by the Spanish, the survivors are reported to have committed suicide by jumping off cliffs into the sea. In 1713, the missions were handed over to the secular clergy. Due to shortages of missionaries, although the missions were established they often went without Christian instruction for long periods of time. Between 1687 and 1700, several missions were founded in Trinidad, but