The provincial governors also had certain military duties. In the northern provinces of New Spain they had charge of defense, with responsibility to the viceroy. [45] In the Philippines, however, and in certain parts of New Spain, where the captain-general took the place of the viceroy, alcaldes mayores and corregidores acted as lieutenants of the captains-general, exercising authority of a military character. [46] They were required to defend their provinces and districts against invasions, insurrections, Indian outbreaks, and disturbances. They were authorized to impress men for military service. Local conditions in Mexico, Perú, Central America, and the Philippines caused some differentiation in these matters. This description will serve to convey an impression of the nature of the duties of these officials and the way in which they acted as the agents of the captain-general, viceroy, and audiencia. [47] It has been already pointed out that the alcaldes mayores and corregidores had extensive judicial duties; a mere restatement of that important fact will suffice at this time. In subsequent chapters we shall study in detail numerous illustrations and instances of the judicial functions of the provincial judges. It has been noted also that the alcaldes ordinarios were the judges of the Spanish towns. So they were in the Philippines, but, as there were only four or five Spanish towns in the archipelago, the alcaldes ordinarios do not assume great prominence in this study. These alcaldes were usually chosen by the ayuntamientos (municipal councils), though they were appointed on some occasions by the governors. As the Spanish towns enjoyed special privileges conferred by the king, their judges were not a part of the regular judicial hierarchy, but were dependent on their ayuntamientos or the governor. However, an oidor was usually delegated to inspect the work of the alcalde ordinario. With this introductory view of the general field of Spanish colonial administration, and this presentation of the characters and elements which are to assume important roles in this discussion because of their frequent relations with the audiencia, we may enter upon a more detailed study of a single institution. It has been emphasized especially that the audiencia in the Philippines was only an integral part of the governmental machinery used in the colonial empire of Spain. It is clear, therefore, that we are not studying an isolated tribunal, for every royal cédula promulgated to the Philippine audiencia was in some way related to those issued to ten or eleven other audiencias of equal status or similar character. Although the Philippines were apart physically, this institution, with its relation to the provincial and colonial governments on one hand, and the home government on the other, brought the colony as close as possible to Spain, and to the other colonies.