Adolf Hitler decided that "all the rubbish of small nations still existing in Europe must be liquidated," even if it meant he would later "be attacked as the 'Butcher of the Swiss.'"
The 1940 Nazi invasion plan, Operation Tannenbaum, was not executed, and SS Oberst Hermann Bohme's 1943 memorandum warned that an invasion of Switzerland would be too costly because every man was armed and trained to shoot.
The other European nations were easily toppled and had little means to wage a partisan war against the occupation. Once their standing armies were defeated, the governments capitulated and the populaces were defenseless.
Only in Switzerland was the entire populace armed and prepared to wage a relentless guerrilla war against an invader. When the war began in 1939, Switzerland mobilized 435,000 citizen soldiers out of a population of 4.2 million. Production figures for Swiss service rifles, which had firepower equal to those of the Germans, demonstrate an ample supply of small arms. Swiss militiamen were instructed to disregard any alleged "official" surrender as enemy propaganda and, if necessary, to fight individually. This meant that a nation of sharpshooters would be sniping at German soldiers at long ranges from every mountain