The Serbian campaign of 1914–1915 resulted in the occupation of Serbia by the Central Powers, opening a land route from Berlin to Constantinople and reshaping the Balkan front.
Key Facts
- Campaign start
- 28 July 1914 (Austria-Hungary declares war on Serbia)
- Second invasion launched
- 6 October 1915, led by Field Marshal August von Mackensen
- Serbian army peak strength
- 420,000 soldiers
- Serbian army at liberation
- 100,000 soldiers
- Serbian soldier deaths (Yugoslav est.)
- 265,164 (25% of all mobilized troops)
- Belgrade liberated
- 1 November 1918
By the Numbers
Location
Cause → Event → Consequence
Austria-Hungary declared war on Serbia on 28 July 1914, triggering a 'punitive expedition' under General Oskar Potiorek. After three failed invasion attempts were repelled by Serbian and Montenegrin forces in 1914, the Central Powers reorganized and, in October 1915, coordinated a three-pronged assault involving German, Austro-Hungarian, and Bulgarian forces under Field Marshal August von Mackensen.
The 1915 invasion saw Bulgarian, Austro-Hungarian, and German forces attack Serbia simultaneously from three sides beginning 6 October 1915, overwhelming Serbian defenses. The campaign forced the Serbian army into the Great Retreat through Montenegro and Albania, leading to evacuation to Greece and the establishment of the Macedonian front. Mackensen declared the campaign concluded on 24 November 1915.
Serbia was occupied and divided between Austria-Hungary and Bulgaria. The Central Powers gained temporary dominance over the Balkans and a continuous land corridor from Berlin to Constantinople, enabling German resupply of the Ottoman Empire. Serbia was ultimately liberated in late 1918 following the Allied Vardar Offensive, which broke the Macedonian front; Serbian forces entered Belgrade on 1 November 1918.
Belligerents & Mobilization Analysis
Side A
2 belligerents
Side B
3 belligerents
Oskar Potiorek, August von Mackensen.