The first major Protestant victory of the Thirty Years' War, enabling Swedish expansion into southern Germany.
Key Facts
- Date
- 17 September 1631
- Swedish-Saxon force size
- ~40,150 troops
- Imperial-Catholic League force
- ~31,400 troops
- Swedish intervention began
- June 1630, landing in Pomerania
- Swedish force at landing
- nearly 18,000 troops
By the Numbers
Location
Cause → Event → Consequence
Swedish intervention in the Thirty Years' War began in June 1630, when Gustavus Adolphus landed in Pomerania with around 18,000 troops, financed by French subsidies. In early 1631, Imperial commander Tilly invaded Saxony after Elector John George I formed an alliance with Sweden, prompting the combined Swedish-Saxon army to march on Leipzig.
On 17 September 1631, a Swedish-Saxon army of roughly 40,150 under Gustavus Adolphus and John George I engaged Tilly's Imperial-Catholic League force of 31,400 near Breitenfeld. The Saxon flank was routed early, but the Swedes regrouped, launched sustained counterattacks, and forced Tilly to retreat with substantial losses.
The defeat of Tilly's Imperial-Catholic League army gave Protestants their first significant battlefield success of the war. The victory opened southern Germany to a Swedish campaign and fundamentally shifted the strategic balance, demonstrating the effectiveness of Swedish military tactics against the previously dominant Imperial forces.
Belligerents & Mobilization Analysis
Side A
2 belligerents
Gustavus Adolphus, John George I, Elector of Saxony.
Side B
2 belligerents
Johann Tserclaes, Count of Tilly.