The Caucasus Front or Caucasus Campaign is a term to describe the "contested armed frontier" between lands controlled by the Russian Empire and Ottoman Empire during WWI. In Russian historical literature, it is typically considered a separate theater of the Great War, whereas Western sources tend to view it as one of the campaigns of the Middle Eastern theatre.

The front extended from Caucasus to Eastern Anatolia and Iran, reaching as far as Trabzon, Bitlis, Mus and Van in the west and Tabriz in the east. The land warfare was accompanied by the attacks of the Russian navy in the Black Sea Region of Ottoman Empire.

Russian advance on the Caucasus front was halted in 1917 by the Russian Revolution, and the Russian forces at the front line were replaced by the forces of the newly-established Democratic Republic of Armenia (DRA), comprising of the Armenian volunteer units and the Armenian irregular units. Along with Germany, the Ottoman Empire signed the Treaty of Brest-Litovsk with Russia, formally recognizing the Ottoman control of Ardahan, Kars, and Batum. The subsequent brief war between the Ottoman Empire and the DRA resulted in the latter's defeat and the signing of the Treaty of Batum. However, the effects of this arrangement were voided few months later, when the Ottoman Empire accepted its own defeat in World War I by signing the Armistice of Mudros.

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