Before the migration wave of Tatars, many Islamic Turkic peoples were already on Finnish territory during the Russian reign as regular soldiers. Information about these soldiers can be traced back to at least 1836. It is believed that they were mostly Kazan Tatars and Bashkirs, some of whom were also in Cossack units, The Great Northern War, Russo-Swedish War (1741–1743) and Russo-Swedish War (1788–1790).