Kajmakcalan (Кајмакчалан, Kaimaktsalan) is the highest peak of Mount Nidze (2.521 m) and during the WW1 (First World War) one of the key positions on the Macedonian Front.
Kajmakcalan Battle was fought between 12 and 30 September 1916, and is considered an extension of the Battle of Gornichevo (Monastir Offensive / Bitola Offensive).
A strategic objective of the Entente armies at the beginning of operations was to conquer Kajmakcalan (Кајмакчалан), which dominates the entire region with its height and massiveness.
The armies of the Central Powers defended the mountains with two lines of trenches and wire obstacles. After fierce Allied artillery bombardment on the night of September 17, 1916 they managed to break through the defense and conquer the first line of trenches.
Between 26 and 30 September, the fighting around the top Kajmakcalan was fierce, until the Serbian army finally conquered it and kept it on 30 September. Human casualties were enormous on both sides, primarily due to man to man fight.
Despite the allied capture of the peak Kajmakcalan, Bulgarian-German forces managed to keep the side positions. Yet the capture of Kajmakcalan, had created favorable conditions for the Allied armies in further operations on Bitola battleground.