Rubuta ci gaba don wannan sakin layi - Bayan Dokar Maidowa ta Sarkin sarakuna Ferdinand II a lokacin da shi da Catholic League suka yi nasara a soja a 1629, Furotesta a cikin Daular Roman Mai Tsarki ya kasance cikin haɗari sosai. A watan Yuli na shekara ta 1630, Sarki Gustav II Adolf na Sweden ya sauka a Daular Pomerania don ya taimaki Furotesta na Jamus. Ko da yake an kashe shi a yaƙi a Lützen, kudu maso yammacin Leipzig, sojojin Sweden sun ci nasara da yawa bisa abokan gabansu Katolika. Duk da haka, nasarar da aka yi a Nördlingen
a 1634 ya yi barazanar ci gaba da shiga cikin Yaren mutanen Sweden a yakin. Sakamakon haka, Sarkin ya yi zaman lafiya da abokan adawarsa na Jamus a cikin Zaman Lafiya na Prague - ainihin sake soke Dokar Maidowa - yayin da Faransa ta shiga tsakani kai tsaye don hana daular Habsburg samun iko sosai a kan iyakarta ta gabas.