The third period of the war was the extended siege of the last White forces in the Crimea. General Wrangel had gathered the remnants of Denikin's armies, occupying much of the Crimea. An attempted invasion of southern Ukraine was rebuffed by the Black Army under Makhno's command. Pursued into the Crimea by Makhno's troops, Wrangel went over to the defensive in the Crimea. After an abortive move north against the Red Army, Wrangel's troops were forced south by Red Army and Black Army forces; Wrangel and the remains of his army were evacuated to Constantinople in November 1920.