 Complete the following phrase:  The Fort of Aubin-Neufchâteau  is a Belgian fortification located near Neufchâteau. The fort was built in the 1930s as part of the fortified position of Liège, augmenting the twelve original forts built to defend Liège in the 1880s with four more forts closer to the Belgian frontier with Germany. The fort surrendered to German forces in the opening days of World War II, following the 