Siege of Akhoulgo
1839 CE.
Shown on the map at 42.777°, 46.742°.
The siege of Akhulgo took place in June–August 1839 during the Caucasian War between the Russian Empire and the Caucasian Imamate led by Shamil. General Pavel Grabbe besieged Imam Shamil in the rock-fortress of Akhulgo. After 80 days the rock was taken and most of the defenders were killed, but Shamil managed to escape.
Text from the Wikipedia article Siege of Akhoulgo, licensed CC BY-SA 4.0.