The article examines the garrison of Nerchinsk district in 1660–1670s. Formation of Russian military force for defending its southeastern borders had been established during this period in Dauria. The military forces located in Nerchinsk, Telenbinsk and Itantsinsk were too small in number to resist Mongol and Qing Empire troops effectively. The replenishment of Nerchinsk garrison staff happened at a slow pace, at the same time, Daurian military forces could not be strengthened by transferring troops from other places to Transbaikalye and Amur region. Free military contingent from Western Siberian cities was diverted to countermeasure the nomads in southern Siberia. There were not enough warriors in Yakutsk district to «pacify non-peaceful foreigners». Most of warriors in Yeniseisk and Ilimsk were in various «sovereign services» and could not be sent to Dauria. The government was unable to strengthen the southeastern border with people and pursued a policy of avoiding conflicts with neighbors, but at the same time it was sending stocks of weapons and ammunition to the region in case of military threat. The article provides a list of Nerchinsk garrison members in 1675–1677.