As part of the peace settlement of the War of the Spanish succession, Britain obtained the "asiento", a Spanish government contract, to supply slaves to Spain's new world colonies, providing British traders and smugglers more access to the traditionally closed Spanish markets in America. This arrangement also contributed heavily to the spread of piracy across the western Atlantic at this time. Shipping to the colonies boomed simultaneously with the flood of skilled mariners after the war. Merchant shippers used the surplus of sailors' labor to drive wages down, cutting corners to maximize their profits, and creating unsavory conditions aboard their vessels. Merchant sailors suffered from mortality rates as high or higher than the slaves being transported (Rediker, 2004). Living conditions were so poor that many sailors began to prefer a freer existence as a pirate. The increased volume of shipping traffic also could sustain a large body of brigands preying upon it. Among the most infamous Caribbean pirates of the time were Edward Teach or "Blackbeard", Calico Jack Rackham, and Bartholomew Roberts. Most of these pirates were eventually hunted down by the Royal Navy and killed or captured; several battles were fought between the brigands and the colonial powers on both land and sea.