sentences:  After the German occupation of Czechoslovakia border regions as a result of the Sudeten Crisis, the Germans used these objects to test and develop new weapons and tactics, plan, and practise the attacks eventually used against the Maginot Line and Belgium's forts, resulting in astounding success.After the fall of Belgium, France and the Low Countries, the Germans began to dismantle the "Beneš Wall", blowing up the cupolas, or removing them and the embrasures, some of which were eventually installed in the Atlantic Wall.Later in the war, with the Soviet forces to the east collapsing the German front, the Germans hurriedly repaired what they could of the fortifications, often just bricking up the holes where the embrasures once were, leaving a small hole for a machine gun.