After the First World War, Poland and Lithuania both regained their independence but soon became immersed in territorial disputes. During the Polish–Soviet War, Lithuania signed the Moscow Peace Treaty with the Soviet Union that laid out Lithuania's frontiers. This agreement gave Lithuanians control of the city of Vilnius (, ), the old Lithuanian capital, but a city with a majority Polish population. This heightened tension between Lithuania and Poland and led to fears that they would resume the Polish–Lithuanian War, and on 7 October 1920, the League negotiated the Suwałki Agreement establishing a cease-fire and a demarcation line between the two nations. On 9 October 1920, General Lucjan Żeligowski, commanding a Polish military force in contravention of the Suwałki Agreement, took the city and established the Republic of Central Lithuania.