The Romanian peace was nullified by the November 11 Armistice, which brought down the Central Powers as a whole, accelerating the territorial breakup of Austria-Hungary ("see Aster Revolution"). On his way to propagate the Banat Romanian cause in France and Britain, Imbroane made a secretive visit to his native land, where an unrecognized democratic republic had just been superseded by a Serbian intervention. He collected terrain data which he later provided to the Supreme War Council. On November 24, he met with the Romanian National Council, which opposed incorporation into Serbia, and proposed to them that Banat unite with Romania unilaterally and unconditionally. Later, this demand was supplemented by a call for Romanian Banatians to defend the region against other countries. Imbroane and other Romanian nationalists also preserved contacts with Stefan Frecôt, a leader of the German-speaking Danube Swabian community, who soon became a supporter of Banat's unconditional union.