The Ottoman Army was the army of the Ottoman Empire after the country was reorganized along modern western European lines during the Tanzimat modernization period. It operated during the decline and dissolution of the empire, which roughly occurred between 1861 and 1918, the end of World War I for the Ottomans. The Crimean War was the first war effort in which the modern army took part in, proving itself as a decent force. The last reorganization occurred during the Second Constitutional Era.

The Russo-Turkish War was a conflict between the Ottoman Empire and a coalition led by the Russian Empire which included Bulgaria, Romania, Serbia, and Montenegro. Fought in the Balkans and in the Caucasus, it originated in emerging 19th-century Balkan nationalism. Additional factors included the Russian goals of recovering territorial losses endured during the Crimean War of 1853–1856, re-establishing itself in the Black Sea and supporting the political movement attempting to free Balkan nations from the Ottoman Empire.