It is little known that in addition to World War II, which began in 1941 (in Yugoslavia), the another war was fought in Donji Kalemegdan that year - the one for the cultural heritage and heritage of the fortress, the symbol of Belgrade. Ahnenerbe, an organization famous for the misuse of archaeological and pseudoarchaeological research, wanted to put the history of the Belgrade fortress for the purpose of Nazi propaganda by excavating it on Kalemegdan.