This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The Schmalkaldic War was fought within the Holy Roman Empire between Emperor Charles V and the Schmalkaldic League, a defensive alliance of Lutheran princes and free imperial cities formed in 1531 at Schmalkalden specifically to protect the Reformation from imperial suppression, led by Elector John Frederick I of Saxony and Landgrave Philip of Hesse. Charles V, having secured a temporary truce with both France and the Ottomans on his other fronts, moved decisively against the League once it had grown to include most of Protestant Germany within its ranks.
Charles defeated the League's forces at the Battle of Muhlberg in April 1547 and captured its two leading princes, John Frederick and Philip of Hesse, aided in the campaign by Duke Maurice of Saxony, a Lutheran ruler who nonetheless sided with the emperor against his own cousin John Frederick for reasons of dynastic rivalry between their two branches of the Saxon house. The victory was decisive and total, dissolving the League outright and imprisoning the two men who had led it, an outcome few observers on either side had expected only a few years earlier.