Battle of Shipka Pass
1877 CE.
Shown on the map at 42.767°, 25.317°.
The Battle of Shipka Pass consisted of four battles that were fought between the Russian Empire, aided by Bulgarian volunteers known as opalchentsi, and the Ottoman Empire for control over the vital Shipka Pass during the Russo-Turkish War (1877–1878). The final battle is known as the battle of Shipka-Sheynovo or simply the battle of Sheynovo (Russian: Шипко-Шейновское сражение; Bulgarian: Шейновска битка). In July 1877, four Russian corps crossed the Danube River and entered Bulgaria. Preceding the main Russian army, Iosif Gurko led a detachment of 11,000 men to capture the vital Balkan Mountain passes. In just over two weeks, Gurko had captured three important mountain passes but the main army was held up the day after Shipka Pass fell in the Siege of Pleven. Thus the defense of the pass was left to the Russian vanguard as well as Bulgarian volunteers. The Ottoman Army made two major attempts to retake the pass in 1877, but was unsuccessful, as the Russian and Bulgarian defenders were able to hold the pass against this overwhelming force, playing an important role in the war.
Text from the Wikipedia article Battle of Shipka Pass, licensed CC BY-SA 4.0.