I roto i te 1656, i te timatanga o te Tuarua Northern War, te Brandenburgian Hohenzollern tangohia te Prussian duchy me Ermland (Ermeland, Warmia) rite Swedish fiefs i roto i te Tiriti o Königsberg, i mua i te kingi Swedish tukua ratou i te vassalage ka meinga ratou tino rangatira i roto i aua kawanatanga. Whai muri i tana whawhai tahi me te ope Sweden i te tau 1656, ko te mea nui rawa atu i te Pakanga o Warsaw
, Hohenzollern Frederick William I i pai ki te whakarere i tana hoa i te wa i huri te pakanga ki a raatau ka tohu i tana hiahia ki te huri i nga taha mena ka whakawhiwhia e te Kingi o Polani a John II Casimir Vasa ki a ia he mana rite ki te Kingi o Sweden a Charles X Gustav, nga tikanga i whiriwhiria i Wehlau (Welawa, inaianei Znamensk) me Bromberg (Bygost, Bydgoszcz).