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 duka 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 karshe, Jamus ya gani da abin da ya faru a cikin watan Yuli 186
Shekara ta 1866