Battle of Nördlingen

Despite the significant commitment of French forces allied with the Protestants, the battle ends in a major defeat that shifts the balance in the Thirty Years' War, with the loss of support from several German princes.

France actively supported the Protestants to weaken the Habsburgs, but this defeat temporarily slowed their advance. Unable to exploit Lützen after Gustavus Adolphus's death, the Swedes saw the Imperials regain the initiative and threaten Saxony. The Protestants planned a night attack on Regensburg.

Frontal assaults on fortified positions, intense infantry fighting, use of heavy artillery, French and allied tactical errors. The Protestant night attack was blocked by artillery and supply wagons ahead of the infantry; Swedish infantry broke one flank, but a coordinated counter-attack routed the Saxon line.

Withdrawal of Protestant princes from the conflict, consolidation of the Empire, but later intensification of direct French involvement. First Swedish setback in the Thirty Years' War: 12,000–14,000 allied losses, Gustaf Horn captured. This Imperial and Spanish victory led France to intervene openly in the conflict.