Frederick William I, Elector of Brandenburg, receives the news in the Rhine valley, and turns northeast to confront Wrangel.

The armies meet in the Battle of Fehrbellin on June 18 (OS) or June 28 (NS).

The Fehrbellin affair is a mere skirmish, with actual casualties amounting to fewer than six hundred men, but it is a defeat by a numerically inferior force from a territory which Sweden has little regard for.

As a result of this defeat, Sweden, long considered unbeatable, appears vulnerable, encouraging neighboring countries which had suffered invasion by Sweden in the prior Swedish campaigns to join in the Scanian War.

Wrangel retreats to Swedish Demmin.

Frederick William henceforth is known as the Great Elector, and the army that he and Derfflinger have led to victory becomes the core of the future Prussian army.

June 28th is to become a holiday that will be celebrated in Germany up until 1914, when on the same day, the Archduke Franz Ferdinand is assassinated, beginning the First World War.