History of military intelligence - period of the First Republic
The offensive section gained information mostly through the agency networks placed generally abroad. It disposed of agency network used in peacetime and network activated in the higher tension and wartime. It used spies, who had a role of courier, "dead drops" and "tipsters", who predicted persons eligible for cooperation.
Defense section of the Military Intelligence had even a task to prevent infiltration of foreign espionage groups in the Czechoslovak Army and areas important for defense support of the CSR (arms industry, defense facilities development, etc.). It used the same or similar forms and methods of work as the offensive section, however, mainly in the country. Among others, it used institutions of intelligence officers of the peace army in all garrisons and in all levels of command. It checked military men and civilians coming in touch with classified information on activities and interests of hostile secret service. A national defense Act was as a legal base of its activities. According to this act, the service monitored activities of political parties, movements and organizations, which had programs and activities threatening the existence of the CSR.
Defense section tightly cooperated with gendarmerie, all parts of state police and intelligence service of the Interior Ministry. The section had some rights of executive. It carried investigation and monitoring in cases of special importance - for these cases, it had its own law experts.
The first commander of the Military Intelligence was a Brigadier General D.C.L. Vladimír Chalupa. He had a reputation of a person of a good character, deliberate, prudent and kind person, who spent most of the time at social events organized for military attachés and close friends from the corps of generals. General Chalupa was originally a judge in the Ostrava region and he was a friend of T.G. Masaryk.