Heilbronn League

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The Heilbronn League was an alliance between Sweden, France, and the Protestant princes of Western Germany against the Catholic League during the Thirty Years' War. The treaty forming the League was signed at Heilbronn in Germany on April 23, 1633.

After the death of Gustavus Adolphus of Sweden, a greater number of German states were desperate to achieve peace. Nevertheless, Wallenstein's continuous military activity, as well as the diplomatic work carried out by Axel Oxenstierna, Sweden’s first minister, failed to bring about a permanent settlement. Most significantly, the search for a peace that would privilege all of those who signed it ensured the continuance of the war.

It was essential that France took on the role of the leader, and provide patronage to their German allies. Together they formed the Heilbronn League, which comprised of the Upper and Lower Rhenish, Swabian and Franconian military circles. Each of the circles was required to provide 2.5 million Reichstaler annually, while the Swedes retained their position as overall military commanders. France also agreed to increase the revenue that it would supply, as the death of Gustavus had caused France to have a greater influence on the military situation overall.