The earliest record about a stronghold known as a "sich" refers to the one was located on the island of Small Khortytsia (Mala Khortytsia Island) and was established by the Volhynian prince Dmytro Vyshnevetsky. The Small Khortytsia Island is 20 times smaller than Khortytsia itself. The first Khortytsia Sich existed six years (1552–1558). There are few others locations downstream past the rapids (Zaporizhzhia area) where the Zaporizhian Sich was located. There are eight of them: Bazavluk (1593–1630), Mykytyn (1628–1652), Chortomlyk (1652–1709), Kamin (1709–1711), Oleshkiv (1711–1734), Pidpilna (1734–1775). All these places were at river crossings. The uprising led by Bohdan Khmelnytsky was started at the Mykytyn Sich in 1648. Legends state, that cossacks wrote the notorious Reply of the Zaporozhian Cossacks to Sultan Mehmed IV of the Ottoman Empire on Khortytsia. In the 1775, the Sich was destroyed by the Russian general Tekhely on the order of Catherine the Great. The Zaporozhian Cossacks as a result were displaced, many eventually settling on the Kuban river in the Caucasus area. These Cossacks became known as Kuban cossacks. A part of the Zaporozhian Cossacks escaped to beyond the Danube to become vassals of the Ottoman Sultan. They dwelt at mouth of the Danube river. In 1830 many of these Cossacks moved and established a new Sich on the Azov sea shore (between Mariupol and Berdiansk).