But the most important test of the consistency of the reformed Russian army took place in the course of a new Russian-Turkish war, which began in April 1877. In June, Russian troops crossed the Danube and began the siege of Plevna, defended a strong Turkish garrison. The Turks defended themselves with exceptional tenacity, made daring attacks, inflicting heavy damage to Russian. At one time it seemed that the war will end and have nothing in disgrace back across the Danube. Finally, the turning point in mid-November. on November 16 in the South Caucasus was captured Kars on 28 November fell Pleven. Encouraged by this victory of Russian troops in the winter moved through the Balkans to Rumelia. City give up the city, surrendered the whole body of Turkish troops. The forward detachments occupied Plovdiv and Edirne. Sultan for peace. Under the peace treaty (finally signed in 1879 in Istanbul), Serbia, Bulgaria, Montenegro and Romania were recognized as independent kingdoms. Russia received Batum, Kars and southern Bessarabia.