Kammala jumla mai zuwa: Denmark ta shiga cikin Yaƙe-yaƙe na Napoleon a gefen Faransa lokacin da Birtaniyya ta kai hari a Yaƙin Copenhagen a 1801 da 1807. Rashin nasarar da Napoleon ya yi a ƙarshe ya haifar da rushewar ƙungiyar Denmark-Norway. Babban fadace-fadace na gaba sun kasance kan ikon Schleswig, a cikin Yaƙin Schleswig na Farko da na Biyu. Denmark ta kasance tsaka tsaki a yakin duniya na farko, amma a yakin duniya na biyu kasar ta kasance
Jamus ta Nazi ta mamaye, tare da gwagwarmaya kaɗan, a cikin 1940.