During the Great Northern War, at least 120,000 men surrendered and were held in Russian POW (prisoner of war) camps until the war ended. After the defeats at Poltava and Perevolochna there were about 20,000 to 25,000 Swedes that capitulated Individual surrenders were uncommon, usually a large unit surrendered all its men. Most of them were put to work in Ukraine, Moscow and Saint Petersburg. Another large group was moved into Siberia and Ural, where they began working in mining under the command of Vasily Tatishchev.