Operation Tannenbaum, known earlier as Operation Grün, was a planned invasion of Switzerland and Liechtenstein by the Axis powers during World War II.
Durchmarschpläne IMG 1701
The Swiss National Redoubt is a defensive plan developed by the Swiss government beginning in the 1880s to respond to foreign invasion. In the opening years of the Second World War the plan was expand
Plan of the defence lines of the National Redoubt[citation needed]
Camouflaged cannon beside the Lago di Lucendro. It has a 105 mm calibre and fires up to range of 17 kilometres (11 mi).
Instructions to the Swiss population in case of war. Point 7 tells people to stay where they live. 8: Only minor evacuations would ever take place. 9: Announces the use of deadly force if any refugees clog roads and paths – presumably those leading to the alpine redoubt.
Camouflaged infantry fortification in Sufers (machine gun bastion left, antitank gun right, housing, and connecting tunnel)