By the mid-sixteenth century, there were an estimated seven thousand maroons (runaway slaves) beyond Spanish control on Hispaniola. The Bahoruco Mountains were their main area of concentration, although Africans had escaped to other areas of the island as well. From their refuges, they descended to attack the Spanish. In 1546 the slave Diego de Guzman led an insurrection that swept through the San Juan de la Maguana area, after which he escaped to the Bahoruco Mountains. After his capture, de Guzman was savagely killed and some of his fellow rebels were burned alive, others burned with branding irons, others hung, and others had their feet cut off. The most extended insurrection was led by Sebastián Lemba. For fifteen years Lemba attacked Spanish towns, plantations, and farms with an army of four hundred Africans. Lemba was eventually caught and was executed in 1548. His head was mounted on the door that connected the Fort of San Gil (today Fort Ozama) to Fort Conde, and for centuries it was called "the Lemba door". Insurrections continued to burden the colony's tranquility and economy. From 1548 to the end of the sixteenth century, maroons attacked farms, plantations, and villages. By 1560 the colony was unable to recruit and pay troops to pursue the rebels.