 Garo reGardoš, rinozivikanwawo seGaro reZemun kana kuti Citadela, ndiro chikamu chekare chakasimbiswa cheOld Zemun uye chinoonekwa seimwe yenzvimbo dzakanakisisa dzekuona dzakanaka dzeBelgrade. Masvingo aripo nhasi anobva muzana remakore rechi14 nerechi15. Nhare yakavakwa sechikamu chehurongwa hweHungary hwekudzorera kana kuvaka nhare pamiganhu yavo yekumaodzanyemba, kusanganisira nhasi zvakare yakaparadzwa asi ichipona Kupinik neSlankamen, semhinduro yekupinda kweOttoman. Gardoš akanga ane basa guru muna 1456 Siege of Belgrade, apo mauto eHungary akatungamirirwa naJohn Hunyadi akadzinga maOttoman, uye 1521 Siege of Belgrade, apo vaOttoman, vachitungamirirwa naSultan Suleiman the Magnificent vakakunda zvose Belgrade neZemun. Boka rose revarwi rakanga riri paGardoš Fortress, rakatungamirirwa nemauto eŠajkaši, rakaurayiwa muhondo uye nhare ndiyo yakanga iri nzvimbo yekupedzisira yehondo yose. Mufananidzo muduku wa1608 waMaximilian Prandstatter unoratidza nhare yakachengetedzwa zvakakwana, yakazara nedenga. Zvisinei, mifananidzo yeZemun yomuzana remakore rechi17 inoratidza matongo chete. 