Operation Tannenbaum (English: Operation Fir Tree or Christmas Tree), known earlier as Operation Green, was a planned but cancelled invasion of Switzerland by Nazi Germany during World War II.
Read more about Operation Tannenbaum: Background, Military Preparations, German Plans For Nazi Rule in Switzerland
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“Human knowledge and human power meet in one; for where the cause is not known the effect cannot be produced. Nature to be commanded must be obeyed; and that which in contemplation is as the cause is in operation as the rule.”
—Francis Bacon (1560–1626)