The Battle of the Frontiers is a general name for all of the operations of the French armies until the Battle of the Marne. A series of encounter battles began between the German, French and Belgian armies, on the German-French frontier and in southern Belgium on 4 August 1914. The Battle of Mulhouse (Battle of Alsace ) was the first French offensive of World War I against Germany. The French captured Mulhouse until forced out by a German counter-attack on 11 August and fell back toward Belfort. The main French offensive, the Battle of Lorraine , began with the Battles of Morhange and Sarrebourg () advances by the First Army on Sarrebourg and the Second Army towards Morhange. Château Salins near Morhange was captured on 17 August and Sarrebourg the next day. The German 6th and 7th armies counter-attacked on 20 August, the Second Army was forced back from Morhange and the First Army was repulsed at Sarrebourg. The German armies crossed the border and advanced on Nancy but were stopped to the east of the city.