of the Spanish were already experienced soldiers who had previously campaigned in Europe. The initial incursion into Guatemala was led by Pedro de Alvarado, who earned the military title of Adelantado in 1527; he answered to the Spanish crown via Hernán Cortés in Mexico. Other early conquistadors included Pedro de Alvarado's brothers Gómez de Alvarado, Jorge de Alvarado and Gonzalo de Alvarado y Contreras; and his cousins Gonzalo de Alvarado y Chávez, Hernando de Alvarado and Diego de Alvarado. Pedro de Portocarrero was a nobleman who joined the initial invasion. Bernal Díaz del Castillo was a petty nobleman who accompanied Hernán Cortés when he crossed the northern lowlands, and Pedro de Alvarado on his invasion of the highlands. In addition to Spaniards, the invasion force probably included dozens of armed African slaves and freedmen. Spanish weapons and tactics Spanish weaponry and tactics differed greatly from that of the indigenous peoples of Guatemala. This included the Spanish use of crossbows, firearms (including muskets and cannon), war dogs and war horses. Among Mesoamerican peoples the capture of prisoners was a priority, while to the Spanish such taking of prisoners was a hindrance to outright victory. The inhabitants of Guatemala, for all their sophistication, lacked key elements of Old World technology, such as the use of iron and steel and functional wheels. The use of steel swords was perhaps the greatest technological advantage held by the Spanish, although the deployment of cavalry helped them to rout indigenous armies on occasion. The Spanish were sufficiently impressed by the quilted cotton armour of their Maya enemies that they adopted it in preference to their own steel armour. The conquistadors applied a more effective military organisation and strategic awareness than their opponents, allowing them to deploy troops and supplies in a way that increased the Spanish advantage. In Guatemala the Spanish routinely fielded indigenous allies; at first these were Nahuas brought from the recently conquered Mexico, later they also included Mayas. It is estimated that for every Spaniard on the field of battle, there were at least 10 native auxiliaries. Sometimes there were as many as 30 indigenous warriors for every Spaniard, and it was the participation of these Mesoamerican allies that was particularly decisive. In at least one case, encomienda rights were granted to one of the Tlaxcalan leaders who came as allies, and land grants and exemption from being given in encomienda were given