In the 21st century - as in the first half of the 20th century - Lithuania has faced threats posed to its national security and statehood. Owing to its limited resources, the country is not essentially able to establish large regular forces; therefore, it is permanently developing its territorial defence forces. In the interwar period, their nucleus was formed by the Lithuanian Riflemen’s Union, while in the 21st century it is by the National Defence Volunteer Forces. While modelling new concepts of territorial defence, it is inevitable to consider not only the practices of other countries and their military theories but also Lithuania’s national experience. Of course, this is the experience of 1990-2004, but in the first part of the 20th c...