Why did Frederick William lose western Pomerania again in the Peace of Saint-Germain-en-Laye?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Frederick William, the Elector of Brandenburg, lost western Pomerania in the Peace of Saint-Germain-en-Laye in 1679 primarily due to intense French pressure.1

Although Frederick William had successfully conquered western Pomerania by force during the Scanian War, his position became untenable after he was abandoned by his allies. France, which had emerged from the Dutch War in a favorable diplomatic and military position, used the peace negotiations to support its ally, Sweden. Consequently, Frederick William was compelled to yield his territorial gains and restore the region to Swedish control.123