The last endeavor led to a war with Qing dynasty China, which had a claim of suzerainty over the two provinces. The excitement caused in Paris by the sudden retreat of the French troops from Lạng Sơn during this war led to the Tonkin Affair: his violent denunciation by Clemenceau and other radicals, and his downfall on 30 March 1885. Although the treaty of peace with the Chinese Empire (9 June 1885), in which the Qing dynasty ceded suzerainty of Annam and Tonkin to France, was the work of his ministry, he would never again serve as premier.