Montenegro unconditionally joined Serbia on November 26, 1918 in a controversial decision of the Podgorica Assembly, and soon afterwards became a part of the Kingdom of Serbs, Croats, and Slovenes, later renamed Yugoslavia. A number of Montenegrin chieftains, disappointed by the effective disappearance of Montenegro, which they perceived to have resulted from political manipulation, rose up in arms during January 1919 in an uprising known as the Christmas Rebellion, which was crushed in a severe, comprehensive military campaign by 1922–23. Annexation of the Kingdom of Montenegro on November 13, 1918 gained international recognition only at the Conference of Ambassadors in Paris, held on July 13, 1922. In 1929 the newly renamed Kingdom of Yugoslavia was reorganised into provinces ("banovine") one of which, Zeta Banovina, encompassed the old Kingdom of Montenegro and had Cetinje as its administrative centre.