Following the war, she joined the French fleet that entered the Black Sea to intervene in the Russian Civil War in 1919. In June, "Guichen" had withdrawn to the Gulf of Patras in western Greece, where her crew mutinied; Charles Tillon, who later led the Communist Party of France, played a significant role in the mutiny. Unrest also broke out among numerous French vessels, including in home ports, the North Sea, and elsewhere, owing to war weariness, a desire to return home, dissatisfaction with inequality aboard the ships, and anger with the fleet's anti-communist operations. The French authorities resorted to sending a battalion of Senegalese Tirailleurs to board "Guichen" and restore order. After her return to France, she was struck from the naval register in 1921 and broken up.