The Battle of Freiburg, also called the Three Day Battle, took place on 3, 5 and 9 August 1644 as part of the Thirty Years' War. The Bavarian army under Franz von Mercy captured the city of Freiburg on 28 July after a siege of 5 weeks. The French army under Louis II de Bourbon, Duc d'Enghien and marshal Henri de la Tour d'Auvergne, Vicomte de Turenne, tried to recapture it at three separate days. The battle was interrupted due to heavy rain. Although the French won the first day of the battle at the Bohl hill near Ebringen, they didn't manage to recapture Freiburg on the two following days of the battle at the Schlierberg near Freiburg, so the city remained in Bavarian hands.

• http://en.wikipedia.org/wiki/Battle of Freiburg