The Ettlingen Line or Lower Line was a defensive line built in 1707 during the War of the Spanish Succession from brushwood and palisades, which replaced the 1701 Bühl-Stollhofen Line after that had been destroyed in May 1707 and levelled by French troops.
Several months after the loss of the Bühl-Stollhofen Line, work began on the Ettlingen Line on the orders of the commander of the Rhine Army, George Louis of Brunswick-Lüneburg. The line was reinforced during the War of the Polish Succession by the introduction of watercourses that could be impounded, but in 1734 French troops broke through them and they were subsequently destroyed, but then rebuilt in 1735. Thereafter they lost their military significance.
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