As the front moved west, and more Belarusian lands were adjoined to the new republic, the first administrative decrees were issued. The entity was divided into seven uyezds: Bobruysk, Borisov, Igumen, Minsk, Mozyr and Slutsk. (Vitebsk, Gomel and Mogilev remained part of the RSFSR.) This time the leaders were Aleksandr Chervyakov (head of Minsk's milrevcom) and Wilhelm Knorin (as chairmen of the Central Committee of the Belarusian Communist Party). The SSRB sought to join further territories, as the Red Army crossed into Poland, but the decisive Polish victory at the Battle of Warsaw in August ended these ambitions. Once again, the Red Army found itself on the defensive in Belorussia. The Poles were able to successfully break the Russian lines at the Battle of the Niemen River in September 1920. As a result, the Soviets were not only forced to abandon their World Revolution targets, but Western Belarus too. However early autumn rains halted the Polish advance, which exhausted itself by October. A cease-fire agreed on 12 October, came into effect on 18 October.