coastal plain used poison on their arrows. In response to the use of Spanish cavalry, the highland Maya took to digging pits and lining them with wooden stakes. Historical sources The sources describing the Spanish conquest of Guatemala include those written by the Spanish themselves, among them two of four letters written by conquistador Pedro de Alvarado to Hernán Cortés in 1524, describing the initial campaign to subjugate the Guatemalan Highlands. These letters were despatched to Tenochtitlan, addressed to Cortés but with a royal audience in mind; two of these letters are now lost. Gonzalo de Alvarado y Chávez was Pedro de Alvarado's cousin; he accompanied him on his first campaign in Guatemala and in 1525 he became the chief constable of Santiago de los Caballeros de Guatemala, the newly founded Spanish capital. Gonzalo wrote an account that mostly supports that of Pedro de Alvarado. Pedro de Alvarado's brother Jorge wrote another account to the king of Spain that explained it was his own campaign of 1527–1529 that established the Spanish colony. Bernal Díaz del Castillo wrote a lengthy account of the conquest of the Aztec Empire and neighbouring regions, the Historia verdadera de la conquista de la Nueva España ("True History of the Conquest of New Spain"); his account of the conquest of Guatemala generally agrees with that of the Alvarados. His account was finished around 1568, some 40 years after the campaigns it describes. Hernán Cortés described his expedition to Honduras in the fifth letter of his Cartas de Relación, in which he details his crossing of what is now Guatemala's Petén Department. Dominican friar Bartolomé de las Casas wrote a highly critical account of the Spanish conquest of the Americas and included accounts of some incidents in Guatemala. The Brevísima Relación de la Destrucción de las Indias ("Short Account of the Destruction of the Indies") was first published in 1552 in Seville. The Tlaxcalan allies of the Spanish who accompanied them in their invasion of Guatemala wrote their own accounts of the conquest; these included a letter to the Spanish king protesting at their poor treatment once the campaign was over. Other accounts were in the form of questionnaires answered before colonial magistrates to protest and register a claim for recompense. Two pictorial accounts painted in the stylised indigenous pictographic tradition have survived; these are the Lienzo de Quauhquechollan, which was probably painted in Ciudad Vieja in