Bayan da War na Duchies, Jamus samu wani ɗan gajeren lokaci na zaman lafiya. The Gastein Yarjejeniyar, sanya hannu da biyu nasara a kan 14 Agusta 1865, sanya tsohon Danish larduna a karkashin Prussian-Austria iko da kuma kasashen biyu mamaye wani ɓangare na Duchies. Duk da haka, bambancin ra'ayi game da gudanar da larduna da sauri jawo rikici tsakanin tsohon abokan. A kan 9 Yuni 1866, Prussia mamaye Holstein, wanda aka gudanar da Austria. A halin yanzu, ya tambaye Diet na Vienna ga wani janar mobilization na Jamus jihohi da Prussia, wanda ya faru a kan 14 Yuni. Ganin cewa mobilization ba bisa doka ba, Prussia ayyana rushewar Jamusanci Tarayya da kuma mamaye Saxony, Hannover da Hassel-Kassel, fara da tsohon Danish larduna karkashin Prussian-Austrian iko da kuma biyu ƙasashe mamaye wani ɓangare na Duchies. Duk da haka, bambancin ra'ayi game da gudanar da larduna da sauri jawo rikici tsakanin tsohon abokan.
tsarin siyasa na Prussian