Alps

The Alps are a mountain range in southern Europe, stretching over 1,200 kilometers through several countries —Austria, Liechtenstein, Slovenia, Italy, Germany, Monaco, Switzerland and France— known as the "Alpine states".

History
During the 1880s, the government of Switzerland launched a plan called Schweizer Réduit (National Redoubt) to counter foreign military invasions by building a series underground complexes in the central Alps, to which the Swiss armed forces could retreat in the case of being overwhelmed by enemy forces. Backed by a border defense plan known as the Border Line, the main complexes —Fortress Saint-Maurice, the Gotthard Pass and Sargans— were intended to deny invaders the ability to employ the country's transport systems for logistics or transport through the mountains.

Influenced by the development of European border protection strategies in the 1930s, Switzerland continued to erect fortifications in the region until World War II, where the Redoubt was considered as a core asset in the face of potential invasions by Italy and Nazi Germany in a plan denominated Operation Tannenbaum, which never came to pass. The fortesses continued to be of importance during the Cold War, where further construction was secretly undertaken in anticipation of open hostilities between NATO and the Warsaw Pact.

In 2019, the fortesses were discovered and seized by the Federation of USEA in their global insurrection, becoming a major weapons cache and operations center in Europe. The geography of the area protected the rebels from attacks by various militaries, prompting the United Nations' Military Staff Committee to sanction an operation by the United Nations Forces to shut down USEA actions in the area.