During the War of the First Coalition, General der Kavallerie Wurmser's Austro-Allied army threatened to invade Alsace. Accordingly, the French Army of the Rhine manned the Lines of Weissenburg, a line of earthworks dating back to the War of the Spanish Succession. The lines began near Wissembourg and stretched about 20 kilometers in an east-southeasterly direction to the Rhine River at Lauterbourg. This traces the modern-day France-Germany border.