Prussia Did Not Conquer the Netherlands in the Thirty Years’ War

No. The Dutch Republic (United Provinces) was not a belligerent in the Thirty Years’ War (1618‑1648). It fought its own Eighty Years’ War against Spain, concluding with the Peace of Münster (1648)—part of the Westphalia treaties.

Prussia’s Role

Brandenburg‑Prussia participated intermittently, gaining territories (e.g., Pomerania, Minden) but never invaded the Netherlands.

Clarification

The war’s "Dutch" dimension was Spain vs. Dutch Republic; Prussia’s theaters were Central/Eastern European.