Crimea left Khmelnitsky without the aid of his usual Tatar allies. The rebellion ended with the 1654 Treaty of Pereyaslav in which Khmelnitsky's Cossacks, so as to destroy the Russian-Polish alliance against them, pledged their loyalty to the Russian Tsar, who guaranteed their protection, the recognition of their starshyna (officer-nobility) and their property and autonomy under his rule, freeing the Cossacks from the Polish sphere of influence in favor of Russian hegemony. Despite this, the Registered Cossacks remained an official unit of the Polish–Lithuanian Commonwealth army until 1699, with individual Cossacks travelling to the Commonwealth to enroll in its ranks. Cossack Hetmanate According to the Treaty of Zboriv, signed on August 17, 1649, the number of Registered Cossacks increased up to forty thousand. {| class="wikitable" style="text-align:center;margin-left:1em;width:21%;" |+The Regiments of Registered Cossacks in 1649. |- ! # !!Headquarters !! Number of Registered Cossacks |- | 1 || Bila Tserkva || 2990 |- | 2 || Bratslav || 2662 |- | 3 || Cherkasy || 2990 |- | 4 || Chernihiv || 998 |- | 5 || Chyhyryn || 3220 |- | 6 || Kalnyk || 2050 |- | 7 || Kaniv || 3167 |- | 8 || Kiev || 2002 |- | 9 || Korsun || 3470 |- | 10 || Kropyvna || 1993 |- | 11 || Myrhorod || 3009 |- | 12 || Nizhyn || 991 |- | 13 || Pereyaslav || 2986 |- | 14 || Poltava || 2970 |- | 15 || Pryluky || 1996 |- | 16 || Uman || 2977 |} References Bibliography External links Registered Cossacks at Encyclopedia of Ukraine. Cossacks Zaporozhian Host Military history of the Polish–Lithuanian Commonwealth Military units and formations established in 1572 Military history of Ukraine 1572 establishments in the Polish–Lithuanian Commonwealth Military units and formations of Ukraine