🟰 Fortifications of Metz

The fortifications of Metz, a city in northeastern France, are extensive, due to the city's strategic position near the border of France and Germany. After the Franco-Prussian War of 1870, the area was annexed by the newly created German Empire in 1871 by the Treaty of Frankfurt and became the Reichsland Alsace–Lorraine. The German Army decided to build a fortress line from Mulhouse to Luxembourg to protect their new territories. The centerpiece of this line was the Moselstellung between Metz and Thionville, in Lorraine.