These conversions of the Abkhazian princes were, however, not irreversible; during the 19th century, various Shervashidzes shifted back and forth across the religious divide, as the Russians and Ottomans struggled for control of the region. The first attempt to enter into relation with Russia was made by the said Keilash Bey in 1803, shortly after the incorporation of eastern Georgia into the expanding Tsarist empire (1801). After the assassination of this prince by his son Aslan-Bey on May 2, 1808, the pro-Ottoman orientation prevailed but for a short time. On July 2, 1810, the Russian Marines stormed Suhum-Kale and had Aslan-Bey replaced with his rival brother, Sefer-Bey (1810–1821), who had become converted to Christianity and assumed the name of George. Abkhazia joined the Russian empire as an autonomous principality. However, George's rule, as well of his successors, was limited to the neighbourhood of Suhum-Kale and the Bzyb area garrisoned by the Russians while the other parts had remained under the rule of the Muslim nobles. The next Russo-Turkish war strongly enhanced the Russian positions, leading to a further split in the Abkhaz elite, mainly along religious divisions. During the Crimean War (1853–1856), Russian forces had to evacuate Abkhazia and Prince Michael (1822–1864) seemingly switched to the Ottomans. Later on, the Russian presence strengthened and the highlanders of Western Caucasia were finally subjugated by Russia in 1864. The autonomy of Abkhazia, which had functioned as a pro-Russian "buffer zone" in this troublesome region, was no more needed to the Tsarist government and the rule of the Shervashidze came to an end; in November 1864, Prince Michael was forced to renounce his rights and resettle in Voronezh. Abkhazia was incorporated in the Russian Empire as a special military province of Suhum-Kale which was transformed, in 1883, into an "okrug" as part of the Kutais "Guberniya". In July 1866 an attempt made by the Russian authorities to collect information concerning the economic conditions of the Abkhaz, for the purpose of taxation, led to the Lykhnensky revolt. The rebels proclaimed Michael Shervashidze's son George as prince and marched on Sukhumi. Only the strong Russian reinforcements led by General Dmitry Ivanovich Svyatopolk-Mirsky were able to suppress the revolt by the same August.