Operation Tannenbaum

Operation Tannenbaum ("Fir Tree"), known earlier as Operation Grün ("Green"), was a planned but cancelled invasion of Switzerland and Liechtenstein by the Axis Powers during World War II.

Background

Before the outbreak of the Second World War, Adolf Hitler made repeated assurances that Germany would respect Swiss neutrality in the event of a military conflict in Europe.Leitz, Christian (2000). ''Nazi Germany and Neutral Europe during the Second World War'', p. 14. Manchester University Press. In February 1937, he announced to the Swiss Federal Councillor Edmund Schulthess that "at all times, whatever happens, we will respect the inviolability and neutrality of Switzerland", reiterating this promise shortly before the German invasion of Poland. These were, however, purely political manoeuvres intended to guarantee Switzerland's passivity. Nazi Germany planned to end Switzerland's independence after it had defeated its main enemies on the continent.

National Socialist attitudes towards Switzerland

In a meeting held with Fascist Italy's leader, Benito Mussolini, and foreign minister, Galeazzo Ciano, in June 1941, Hitler stated his opinion on Switzerland quite plainly:

In a later discussion, the German Foreign Minister Joachim von Ribbentrop directly alluded to the possibility of carving up Switzerland between the two Axis powers:

In August 1942, Hitler further described Switzerland as "a pimple on the face of Europe" and as a state that no longer had a right to exist, denouncing the Swiss people as "a misbegotten branch of our ''Volk''." From a Nazi viewpoint, Switzerland, as a small, multilingual, decentralized democracy where German-speakers felt more of an affinity with their French-speaking fellow Swiss citizens than towards their German brothers across the border, was the antithesis of the racially homogeneous and collectivised " Führer State".Urner 2001, 17 Hitler also believed that the independent Swiss state had come into existence at a time of temporary weakness of the Holy Roman Empire, and now that German power had been re-established after the National Socialist takeover, the independent country of Switzerland had become obsolete.

Although Hitler despised the democratically-minded German Swiss as the "wayward branch of the German people", he still acknowledged their status as Germans.Norman Rich, ''Hitler's War Aims: the Establishment of the New Order'' (New York: W.W Norton, 1974), 401–402. Furthermore, the openly pan-German political aims of the Nazi party called for the unification of all Germans into a Greater Germany, which included the Swiss people. The first goal of the 25-point National Socialist Program stated that "We he National Socialist Partydemand the unification of all Germans in the Greater Germany on the basis of the people's right to self-determination."

In their maps of Greater Germany, German textbooks included the Netherlands, Belgium, Austria, Bohemia-Moravia, the German-speaking parts of Switzerland, and western Poland from Danzig (Gdańsk in Polish) to Krakau (Kraków). Ignoring Switzerland's status as a sovereign state, these maps frequently showed its territory as a German ''Gau''. The author of one of these textbooks, Ewald Banse, explained, "Quite naturally we count you Swiss as offshoots of the German nation, along with the Dutch, the Flemings, the Lorrainers, the Alsatians, the Austrians and the Bohemians ... One day we will group ourselves around a single banner, and whosoever shall wish to separate us, we will exterminate!" Various Nazis were vocal about the German intent to "expand Germany's boundaries to the farthest limits of the old Holy Roman Empire, and even beyond."

Though the geopolitician Karl Haushofer was not politically aligned with the Nazis, his ideas offered them ideological support. In his work, he advocated for the partition of Switzerland between its surrounding countries, such that the Romandy (''Welschland'') would be awarded to Vichy France, Ticino to Italy, and Northern, Central, and Eastern Switzerland to Germany.

Military preparations

The Swiss government approved an increase in defence spending, with a first installment of 15 million Swiss francs (out of a total multi-year budget of 100 million francs) to go towards modernisation of the armed forces. With Hitler's renunciation of the Treaty of Versailles in 1935, this spending jumped to 90 million francs. The K31 became the standard-issue infantry rifle in 1933, and was superior to the German Kar98 in ease of use, accuracy, and weight. By the end of World War II, nearly 350,000 would be produced.

Switzerland has a unique form of generalship. In peacetime, there is no officer with a rank higher than that of '' Korpskommandant'' (3-star-general). However, in times of war and in 'need', the ''Bundesversammlung'' elects a ''General'' to command the army and air force. On 30 August 1939, Henri Guisan was elected ''General'', with 204 votes out of 227 cast. He immediately began preparations for war.

When, two days after his election, the ''Wehrmacht'' invaded Poland and World War II began, Guisan called for a general mobilisation and issued ''Operationsbefehl'' Nr. 1, the first of what was to become a series of evolving defensive plans. This first plan assigned the existing three army corps to the east, north, and west of Switzerland, with reserves in the centre and south of the country. Guisan reported to the Federal Council on September 7 that by the time Britain declared war on Germany, "our entire army had been in its operational positions for ten minutes." He also had his Chief of the General Staff increase the upper service eligibility age from 48 to 60 years (men of these ages would form the rear-echelon ''Landsturm'' units), and ordered the formation of an entirely new army corps of 100,000 men.

Germany started planning the invasion of Switzerland on 25 June 1940, the day that France surrendered. At this point, the German army in France consisted of three groups with two million soldiers in 102 divisions. Recognizing that Switzerland and Liechtenstein were surrounded by Occupied France and the Axis Powers, Guisan issued ''Operationsbefehl'' Nr. 10, a complete overhaul of existing Swiss defensive plans. In this plan, the Fortress Saint-Maurice, the Gotthard Pass in the south, and the Fortress Sargans in the northeast would serve as the defence line. The Alps would be their fortress. The Swiss 2nd, 3rd, and 4th Army Corps were to stage delaying actions at the border, while all who were able were to retreat to the Alpine refuge known as the '' Réduit national''. The population centres were, however, all located in the flat plains in the north of the country. They would have to be abandoned to the German forces in order for the rest of the country to survive.

After the armistice with France, Hitler demanded to see plans for the invasion of Switzerland. Franz Halder, the head of the ''Oberkommando des Heeres'' (OKH), recalled: "I was constantly hearing of outbursts of Hitler's fury against Switzerland, which, given his mentality, might have led at any minute to military activities for the army." Captain Otto-Wilhelm Kurt von Menges in OKH submitted a draft plan for the invasion. ''Generaloberst'' Wilhelm Ritter von Leeb's ''Heeresgruppe 'C'' (HGr. C), led by ''Generalleutnant'' Wilhelm List and the 12th Army would conduct the attack. Leeb himself personally reconnoitered the terrain, studying the most promising invasion routes and paths of least resistance. Menges noted in his plan that Swiss resistance was unlikely and that a nonviolent ''Anschluss'' was the most likely result. With "the current political situation in Switzerland," he wrote, "it might accede to ultimatum demands in a peaceful manner, so that after a warlike border crossing a rapid transition to a peaceful invasion must be assured."

The German plan continued to undergo revision until October, when the 12th Army submitted its fourth draft, now called Operation Tannenbaum. The original plan had called for 21 German divisions, but that figure was downsized to 11 by the OKH. Halder himself had studied the border areas, and concluded that the " Jura frontier offers no favorable base for an attack. Switzerland rises, in successive waves of forest-covered terrain across the axis of an attack. The crossing points on the river Doubs

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