Vardar offensive

The Vardar offensive (Офанзива при Вардар) was a World War I military operation, fought between 15 and 29 September 1918. The operation took place during the final stage of the Balkans Campaign. On September 15, a combined force of Serbian, French and Greek troops attacked the Bulgarian-held trenches in Dobro Pole ("Good Field"), at the time part of Serbia (present-day North Macedonia). The assault and the preceding artillery preparation had devastating effects on Bulgarian morale, eventually leading to mass desertions. On September 18, a second Entente formation assaulted the Bulgarian positions in the vicinity of Lake Doiran. Effectively employing machine gun and artillery fire the Bulgarians managed to stall the Allied advance on the Doiran sector. However the collapse of the front at Dobro Pole forced the Bulgarians to withdraw from Doiran. The Allies pursued the German 11th Army and the Bulgarian 1st Army, while pushing deeper into Vardar Macedonia. By 29 September, the Allies had captured the former HQ of Skopje, thus endangering the remnants of the 11th Army. The parallel development of the anti-monarchist Radomir Rebellion forced Bulgaria to sign the Armistice of Salonica and withdraw from the war. The treaty included the full capitulation of the 11th Army, bringing the final tally of Bulgarian and German prisoners to 77,000 and granting the Allies 500 artillery pieces. The Bulgarian downfall turned the strategic and operational balance of the war against the Central Powers. The Macedonian Front was brought to an end at noon on 30 September, when the ceasefire came into effect. The 28 June 1914, assassination of Austro-Hungarian heir presumptive Archduke Franz Ferdinand precipitated Austria-Hungary's declaration of war against Serbia. The conflict quickly attracted the involvement of all major European countries, pitting the Central Powers against the Entente coalition and starting World War I. Serbia was defeated during the autumn 1915 phase of the Serbian Campaign, prompting France and Britain to transfer troops from the Gallipoli Campaign to Greek Macedonia.

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Related concepts (8)

Macedonian front

The Macedonian front, also known as the Salonica front (after Thessaloniki), was a military theatre of World War I formed as a result of an attempt by the Allied Powers to aid Serbia, in the autumn of 1915, against the combined attack of Germany, Austria-Hungary and Bulgaria. The expedition came too late and with insufficient force to prevent the fall of Serbia and was complicated by the internal political crisis in Greece (the National Schism).

Bulgaria during World War I

The Kingdom of Bulgaria participated in World War I on the side of the Central Powers from 14 October 1915, when the country declared war on Serbia, until 30 September 1918, when the Armistice of Salonica came into effect. After the Balkan wars of 1912 and 1913, Bulgaria was diplomatically isolated, surrounded by hostile neighbors and deprived of Great Power support. Negative sentiment grew particularly in France and Russia, whose officials blamed Bulgaria for the dissolution of the Balkan League, an alliance of Balkan states directed against the Ottoman Empire.

Serbian campaign

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 campaign, euphemistically dubbed "punitive expedition" (Strafexpedition) by the Austro-Hungarian leadership, was under the command of Austrian General Oskar Potiorek. It ended after three unsuccessful Austro-Hungarian invasion attempts were repelled by the Serbians and their Montenegrin allies.