This chapter discusses the Polish–Lithuanian War of 1919–20. The war flared in May 1919 when the first open clash took place between Lithuanian and Polish troops. It gradually escalated and lasted until late November 1920 when, in Kaunas, both sides agreed to stop fighting along the demarcation line established by the League of Nations. Yet there was no final peace agreement signed, only a truce. And low-scale paramilitary violence continued unabated in the “neutral zone” along the demarcation line until as late as May 1923. The chapter argues that the war against Poland provided an opportunity for total mobilization of the whole of Lithuanian society. The fact that, during the entire interwar period, the conflict remained open-ended, ensured that the paramilitary structures and military laws that emerged during it would remain in place for much longer.
