Wikipedia
The Schwedentrunk is a method of torture and execution. The name was invented by German victims of Swedish troops during the Thirty Years' War. This method of torture was administered by other international troops, mercenaries, and marauders, and especially by civilians following the Swedish baggage train, who received no pay. It was used to force peasants or town citizens to hand over hidden money, food, animals, etc., or to extort sex from women.
Even though 15% to 20% (locally up to 60%) of the German population perished due to violence, famine, and disease during the war, the memory of the Schwedentrunk was preserved. The method was immortalized in one of the first widely read German books, the satirical Der abenteuerliche Simplicissimus published by Hans Jakob Christoffel von Grimmelshausen in 1668.