The third and final period of the war involved fighting in Crimea. Many soldiers of the White Army had gathered there and had made their position very secure and strong. The Red Army continued to fight against them. After the Polish-Soviet War ended with Polish independence, more soldiers of the Red Army could reinforce their comrades in Crimea. They defeated the White Army in November 1920. In October 1922, Vladivostok fell, the last important city held by the Whites. Fighting continued against nationalists in the Caucasus in the early 1920s.