"Swiss mercenaries (Reisläufer) were notable for their service in foreign armies, especially the armies of the Kings of France, throughout the Early Modern period of European ...
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history, from the Later Middle Ages into the Age of Enlightenment. Their service as mercenaries was at its peak during the Renaissance, when their proven battlefield capabilities made them sought-after mercenary troops. There followed a period of decline, as technological and organizational advances counteracted the Swiss´ advantages. Switzerland´s military isolationism largely put an end to organized mercenary activity; the principal remnant of the practice is the Pontifical Swiss Guard at the Vatican." - (en.wikipedia.org 29.02.2020)