The Serbian campaign of 1915 (German: Der serbische Feldzug 1915) refers to a military campaign carried out by the Central Powers, primarily Germany, Austria-Hungary and Bulgaria, against the Kingdom of Serbia during World War I. The campaign took place from October to November 1915.

The Serbian campaign was a series of military expeditions launched in 1914 and 1915 by the Central Powers against the Kingdom of Serbia during the First World War. The first campaign began after Austria-Hungary declared war on Serbia on 28 July 1914 .

The Great Retreat, also known in Serbian historiography as the Albanian Golgotha [4] (Serbian: Албанска голгота, Albanska golgota), refers to the retreat of the Royal Serbian Army through the mountains of Albania during the 1915–16 winter of World War I.

2025年1月22日 · World War I - Serbian Campaign, 1914: The Austrian army invaded Serbia and took Belgrade but a counterattack forced the Austrians to retreat. The Ottoman Empire (now Turkey) entered the war on the side of Germany, and Turkish offensives in the Caucasus and in the Sinai Desert served German strategy by tying Russian and British forces down.

The Serbian Army once again proved its reputation gained during the Balkan Wars. It twice overcame far superior and better-equipped Austro-Hungarian armies (in August and December 1914). In the 1914 campaign, the monarchy employed almost one-third (400,000) of its total forces, and total casualties climbed to 273,813.

Under General August von Mackensen, the joint German and Austro-Hungarian invasion of Serbia began on October 6, 1915, with a heavy bombardment of the Serb capital of Belgrade and other positions along the Danube, Drina, and Save Rivers that shaped Serbia's northern border.

On October 31, 1915, Mackensen launched an attack intended to decisively defeat the Serbian Army at Kragujevac via encirclement. Facing the oncoming German III Corps, Austro-Hungarian units to the west, and the Bulgarian 9th Infantry Division blocking the southern route through Niš, the Serbian army abandoned Kragujevac without a fight.

The victory of the Royal Serbian Army at the battle of Cer is considered the first Allied victory in World War I, and the Austro-Hungarian Army's defeat by Serbia has been called one of the great upsets of modern military history.

The Serbian Campaign began in late July of 1914. It started with the Austria-Hungary invasion of Serbia which is considered a main factor in the outbreak of World War I. The campaign swiftly included forces from the United Kingdom, France, Germany and Russia.

Against Serbia were marshalled the Bulgarian First Army, the German Eleventh Army and the Austro-Hungarian Third Army, all under the control of Field Marshal August von Mackensen. In addition, the Bulgarian Second Army, which remained under the direct control of the Bulgarian high command, was deployed against Macedonia.