Rubuta ci gaba don wannan sakin layi - Denmark ta shiga cikin Yaƙe-yaƙe na Napoleon a gefen Faransa lokacin da Biritaniya 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 ba ta saka hannu a Yaƙin Duniya na Ɗaya ba, amma a Yaƙin Duniya na Biyu an ci ƙasar
, tare da kadan fada, da Nazi Jamus a 1940.