Germany attacked Yugoslavia on 6 April 1941, occupied it and partitioned it. A collaborationist government, headed by Milan Aćimović, was installed in occupied Serbia. Though retired for several years, Kumanudi signed the Appeal to the Serbian Nation. The Appeal, published on 13 August 1941, though appeared to be gathering the population against the Bolshevism and Communism, actually was calling not to oppose the German occupation and to collaborate with the quisling governments of Aćimović and his successor Milan Nedić (Government of National Salvation).