Siege of Breisach
Part of the Thirty Years' War
Date 18 August – 17 December 1638 Location Breisach, Holy Roman Empire 48°2′N 7°35′E / 48.033°N 7.583°E / 48.033; 7.583 Result French-Weimaran victory
Belligerents
France Weimar Army	Holy Roman Empire Bavaria
Commanders and leaders
Bernard of Saxe-Weimar Vicomte de Turenne	Johann von Götzen Federico Savelli
Strength
ca. 14,000–19,000	ca. 3,000–20,000
Casualties and losses
1,700	4,000

The siege of Breisach was fought on 18 August — 17 December 1638 as part of Thirty Years' War. It ended after several unsuccessful relief attempts by Imperial forces with the surrender of the Imperial garrison to the French, commanded by Bernard of Saxe-Weimar.