It's an interest story/legend as to how coffee got introduced to Europe, left behind by the retreating Ottoman army at Vienna. Resulted, apparently, in the invention of the croissant too. The ends don't justify the means, but that's a lot more productive that many recent conflicts.

https://en.m.wikipedia.org/wiki/John_III_Sobieski

https://en.m.wikipedia.org/wiki/Viennese_coffee_house