During the Russo-Turkish War of 1828-1829 he was present at the sieges of Silistria and Shumla.
In 1854 he crossed the Danube and besieged Silistria, but was superseded in April by Prince Paskevich, who, however, resigned on the 8th of June, when Gorchakov resumed the command.
In July the siege of Silistria was raised, and the Russian armies recrossed the Danube; in August they withdrew to Russia.
He continued to extend his territories in the north and west; the king of Servia and the rulers of Kiustendil, Nicopolis and Silistria agreed to pay tribute to the conquering Turk.
Murad thereupon returned to Europe with a large force, and sent Chendereli Zade Ali Pasha northwards; the fortresses of Shumla, Pravadi, Trnovo, Nicopolis and Silistria were taken by him; Sisman III., rebel king of Bulgaria, was punished and Bulgaria once more subjugated.
The successful defence of Varna and Silistria seemed to justify the stubbornness of the Porte.
A quarrel with the commander-in-chief, Rumyantsev, then induced him to send in his resignation, but in 1774 he participated in the capture of Silistria and in the negotiations which led to the peace of Kuchuk-Kainarji.
In April 1854 he again took the field in command of the army of the Danube, but on the 9th of June, at Silistria, where he suffered defeat, he received a contusion which compelled him to retire from active service.
Of Mangalia, on the coast, as far as the Danube at Silistria, 85 m.
At Silistria the river bends N.N.E.
He added to his other titles that of " count of Severin, despot of the Dobrudja, and lord of Silistria," and both Vidin and Sistora appear in his possession.
Michael followed up these " Walachian Vespers " by an actual invasion of Turkish territory, and, aided by Sigismund Bathory, succeeded in carrying by assault Rustchuk, Silistria and other places on the right bank of the lower Danube.
Declared that the islands forming the delta of the Danube, the Isle of Serpents, and the province of Dobrudja, as far as a line starting from the east of Silistria and terminating on the Black Sea south of Mangalia, should be added to Rumania.