Rubuta ci gaba don wannan sakin layi - A shekara ta 1630, Gustavus Adolphus na Sweden ya sauka a Jamus kuma ya sauƙaƙe tashar jiragen ruwa na Stralsund wanda shine mafaka ta ƙarshe a nahiyar da sojojin Jamus suka yi yaƙi da Sarkin. Gustav sa'an nan ya yi tafiya zuwa kudu ya lashe nasara a Breitenfeld da Lutzen, yana jawo goyon baya ga Protestant da ya ci gaba. Yanayin Katolika ya inganta da mutuwar Gustav a Lutzen a shekara ta 1632 da kuma nasara mai ban mamaki ga sojojin Imperial karkashin Cardinal-Infante Ferdinand da Ferdinand II na Hungary a Nordlingen
a shekara ta 1634. Daga matsayin ƙarfi, Sarkin ya kusanci jihohin Jamus da suka gaji da yaƙi tare da zaman lafiya a cikin 1635; da yawa sun karɓa, gami da manyan iko biyu, Brandenburg da Saxony.