Thereby, the victory of the comparatively small Spanish force can be attributed to the presence of Spanish horses, which were unknown to the Inca before the arrival of Pizarro, as well as to the usage of guns and cannons by the Spanish men. Furthermore, the local educational investments, which had an impact on economic growth and development, did not equal those of the Spaniards, with the numeracy level of Peruvian Inca Indios amounting to half the numeracy level of Spanish invaders.