Structure
Every male under Incan rule capable of military service was subject to draft for either the purpose of a single campaign or permanent service. Strict discipline offered punishment in the form of whipping or execution for abuse of civilians by the army while on the march. Officers consisted of two classes: the higher ranked officers were members of the ruling Inca caste, given position and exempt from tribute while lower ranked officers who commanded at most 50 men were natives promoted by higher ranking Inca and not exempt from service.