1631
Battle of Breitenfeld
The setting
Near the village of Breitenfeld, about 8 km north of Leipzig, Electorate of Saxony (modern Germany)
Open, gently undulating farmland favoring large deployments and cavalry; a low ridge and the small Lober stream lay across the field. Dry late-summer ground.
Reveal the outcome
Recorded sideSweden and Electoral Saxony (Gustavus Adolphus; Saxons under John George I/Arnim)
Recorded resultdecisive victory
Decisive Swedish-Saxon victory; first major Protestant triumph of the war
How the atlas explains it
When the inexperienced Saxon wing broke and fled, Gustavus's army did not collapse. His shallow, flexible Swedish brigades with integrated light artillery and disciplined salvo (volley) fire could redeploy under pressure; he refused the exposed flank, wheeled to face Tilly's enveloping tercios, and captured the Imperial guns to turn them on the dense Spanish-style squares. Superior cadence of fire, mobile cannon, and combined cavalry-infantry-artillery coordination ground down a less flexible formation.
What followed
First major Protestant victory of the Thirty Years' War and the first great field defeat of a Habsburg/Catholic League army; validated Gustavus's linear, combined-arms reforms that reshaped European warfare and opened northern Germany to Swedish intervention.