Ka cika wannan magana: A lokacin Yaƙin Shekara-Uku, Sweden ta yi nasarar cin kusan rabin ƙasashen da ke cikin Daular Roma Mai Tsarki. Yaƙin ya ci gaba da sauyawa sau da yawa. Bayan shan kashi a cikin
Yaƙin Nördlingen (1634), amincewa da Sweden tsakanin jihohin Jamus da Sweden ke sarrafawa ya lalace, kuma da yawa daga cikin lardunan sun ƙi ƙarin tallafin soja na Sweden, suna barin Sweden tare da lardunan arewacin Jamus biyu kawai. Bayan da Faransa ta shiga tsakani a bangaren Sweden, al'amura suka sake canzawa. Yayin da yaƙin ya ci gaba, yawan fararen hula da sojoji da suka mutu ya ƙaru, kuma sa'ad da ya ƙare, ya kai ga ƙarancin jama'a a jihohin Jamus. Kodayake ba a sami cikakken ƙididdigar yawan jama'a ba, masana tarihi sun kiyasta cewa yawan mutanen Daular Roman Mai Tsarki ya ragu da kashi ɗaya bisa uku sakamakon yaƙin.