On 6 December 1523, Pedro led his brothers, cousins, and uncle, including Gómez, out of Tenochtitlan in command of a Spanish army consisting of 120 horsemen with 170 horses, 300 foot soldiers, and 130 crossbowmen to what is modern-day Guatemala, beginning the Spanish conquest of Guatemala that would last well into the 17th century. Pedro was known for his cruelness and ruthlessness during his conquest of Guatemala, and the same attributes were shared by his brothers, including Gómez. Atrocities, such as massacres, looting, village burning, rapes, and kidnapping indigenous people for slave labor, were commonly committed by their men.