Baroque fortifications in the Black Forest

The Baroque fortifications in the Black Forest, also called Baroque Schanzen or Black Forest lines, are historical, military earthworks, known as schanzen, that were built in the Black Forest in what is now Germany. They were built in the 17th century to defend the Margraviate of Baden from French invasion. Together with their adjoining defensive lines, the Black Forest fortifications formed a defensive system over 200 kilometres long that ran from north to south.

These defensive positions were built during the time of the conflicts between the House of Habsburg and the Kingdom of France in the 17th and 18th centuries, mainly during the War of the Palatine Succession and the War of the Spanish Succession. After the events of 1689, Margrave Louis William of Baden-Baden, who was also known as "Turkish Louis" thanks to his distinguished service in the Great Turkish War, was given the imperial command of the defence of Germany against the advancing French.

Source: Wikipedia