Pasteur would bear a grudge for the rest of his life. As he once wrote to a friend after the German victory at Metz (where Koch served at the German field hospital), “each of my studies, to my dying day, will bear the epigraph: ‘Hatred of Prussia, vengeance, vengeance!’” Sometimes this retribution took absurd form, as when he created a recipe for a special lager that, he believed, was far better than anything coming out of Munich or Berlin. He called it “Bière de la Revanche Nationale” or “the Beer of Revenge.”
For once, history might remember a person for the right things. Probably. I can't really say without having tasted his beer.