On February 21, 1850, under diplomatic pressure from England, France, and Russia, the Prussian Government signed the Treaty of Berlin between Prussia and Denmark in Berlin.
The Prussian Government recognized the sovereignty of the Kingdom of Denmark over the Schleswig-Holstein Duchies, marking the official end of the Prussia-Denmark war.
Before the treaty was signed and under strong pressure from the Russians, the Prussian Army had essentially withdrawn from the Kingdom of Denmark, including abandoning both Schleswig-Holstein Duchies.
After the treaty was signed, the delegation from the German Federation left the scene in anger, refusing to recognize Denmark's sovereignty over the Schleswig-Holstein Duchies.
The Prussian Government had been tricked; it wasn't just the German regional states that had tricked them, but also the Russians—clearly, Nicholas I was practically warning the Prussians to stay in line.
