The rovers of the sea and the restrictive trade regulations imposed by the Spanish government, which limited trade with the new world to the single port of Seville in Spain, made development of the island's commerce impossible. The trade restrictions had the effect of encouraging a brisk contraband traffic with Dutch vessels on the north coast, to stop which the Spanish government adopted the incredible expedient of shutting up every port except Santo Domingo City and ordering the destruction of the north coast towns. Puerto Plata, Monte Cristi and two villages on the coast of what is now Haiti were thus destroyed in 1606 and the inhabitants transferred to towns almost in the center of the island, where they were far removed from temptation to smuggle. The measure temporarily stopped contraband trade on the north coast, but destroyed all legitimate trade in that region, transformed the coast into a desert and furnished an opportunity for the settlement of the buccaneers in the northwest. The English, French and Dutch, in resisting Spain's claim to sole trading rights in the new world, authorized the fitting out of privateers that often degenerated into pirates. The bays and inlets of the coast of Santo Domingo became favorite resorts for such ships. The depot of the corsairs on the island of St. Christopher having been destroyed by the Spaniards in 1630, a number of refugees sought shelter on the island of Tortuga, on the northwest coast of Haiti. Some of them began to cultivate the soil, others took to hunting wild cattle on the mainland of Haiti, while others indulged in piracy. Tortuga soon became the busy headquarters of reckless freebooters of all nations, who here fitted out daring expeditions and returned to waste their gains in wild carousals. In 1638 the Spanish governor of Santo Domingo made a descent on the island and destroyed the settlement, but most of the buccaneers were absent at the time and the only result of the raid was to cause them to organize under the captaincy of an Englishman named Willis. French national pride asserted itself, however, and with the assistance of a French force from St. Christopher, the English inhabitants of Tortuga, who were in a minority, were persuaded to leave for Jamaica, and Tortuga thenceforth continued under French governors.