Kammala jumla mai zuwa: Duk da haka, a wannan lokacin, Dukkanin Courland ya kasance abin sha'awa ga Sweden da Yaren mutanen Poland. A shekara ta 1655 sojojin Sweden suka shiga yankin Duchy, suka fara
Yakin Yaren mutanen Sweden da Poland (1655-60) Sojojin Sweden sun kama Duke Jacob (1658 <unk> 60). A wannan lokacin, Yaren mutanen Holland sun karɓi mulkin mallaka biyu na Courland waɗanda ba su da kayayyaki da ma'aikata, kuma jiragen ruwa da masana'antu sun lalace. Wannan yaƙin ya ƙare da yarjejeniyar zaman lafiya ta Oliwa (1660). Courland ya sake dawo da Tobago bisa yarjejeniyar kuma ya riƙe shi har zuwa 1689. Duke Jacob ya fara dawo da jiragen ruwa da masana'antu, amma Duke na Courland bai sake kaiwa matakin da ya gabata ba.