 Rambai muchinyora ndima ino - Germany yakamanikidza Yugoslavia kuti ipinde muTripartite Pact, iyo Prince Paul weYugoslavia akabvuma musi wa25 March. Kuratidzira kuchirwisana nechisarudzo chacho nokukurumidza kwakatanga uye coup détatyakatangwa musi wa27 March. Hitler akatora kudengenyeka kwenyika sokutuka kwake pachake ndokutanga kupinda muYugoslavia musi wa6 April 1941. Varwi vazhinji vechiCroat muuto reYugoslavia havana kunzwa Yugoslavia senyika yavo uye vakaramba kurirwira. VaGerman vakaedza kunyengetedza Maček kuti azivise kuzvimiririra kweCroatia pasi pekutsigirwa neGerman, asi akaramba, saka vakasarudza kutsigira Ustaše pachinzvimbo. Maček akadzokera kuZagreb achibva kuBelgrade apo kupindirwa kwakatanga kubatsira kuchengetedza runyararo. Rutsigiro rwake rwakanga rwusina kukwirira muZagreb sezvakanga zvakaita muCroatia yose, uye vakawanda muguta vakanga vatoshandura kuvimbika kwavo kuUstaše. 