Helperlinie, Military fortification in Groningen, Netherlands
The Helperlinie is a military fortification south of Groningen featuring remains of bastions, redoubts, and hornworks. These were defended by dry and wet moats, portions of which are still visible today.
Military architect Menno van Coehoorn designed this in 1698 following the New Dutch Fortification System. This approach was a response to advances in artillery technology.
The fortification shows how the Dutch designed and built their defense systems in the 17th century. The visible earthworks and ditches tell the story of the engineering knowledge from that era.
Parts of the original structure west of Hereweg are protected as an archaeological monument. The best way to explore the remains is on foot, following the paths that trace the former defense lines.
From 1843 to 1852, the fortification moat served as an official swimming area for military personnel. This unexpected use shows how the site was repurposed during peacetime for recreational needs.
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