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In page Prisoner of war:

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The extensive period of conflict during the American Revolutionary War and Napoleonic Wars (1793–1815), followed by the Anglo-American War of 1812, led to the emergence of a cartel system for the exchange of prisoners, even while the belligerents were at war. A cartel was usually arranged by the respective armed service for the exchange of like-ranked personnel. The aim was to achieve a reduction in the number of prisoners held, while at the same time alleviating shortages of skilled personnel in the home country.[citation needed]