Pasteur, an ardent nationalist, was the son of a tanner who served in the Napoleonic wars. Not cut out to be a soldier himself, his deep-seated antipathy of Germany played out in the laboratory rather than on the battlefield. His national pride wounded by Germany's rising dominance in technological and scientific advances, he requested of Napoleon III a state-funded laboratory to further French science.
With the advent of the Franco-Prussian war, his eldest son had enlisted to fight for France, but was struck with typhoid (two of Pasteur’s children had already died from this scourge), Pasteur’s emperor was captured, and construction of the laboratory was stopped - all events calculated to exacerbate Pasteur’s rabid hatred of Germany (a hatred so intense, that he later stated "All my work, to my dying day, will bear as an inscription, 'Hatred towards Prussia! Revenge! Revenge!'")
At the end of the war, Germany annexed most of the Alsace-Lorraine territory of France, a region primarily concerned with the growing of hops and production of beer - a beer that fared poorly in comparison with German beer in international and national markets. So incensed by the popularity of German beer in France, and the thought of Germany taking French land to make German beer, Pasteur decided to wreak revenge on Germany by depreciating its biggest export - beer.
Years earlier, Pasteur (commissioned by the Emperor) had studied "wine diseases," the conditions which caused wine to sour, become bitter, or otherwise go bad - severe problems for France’s wine industry and export businesses. His investigations of and studies on fermentation led to the pasteurization of and preservation of wine, earning him accolades from the emperor himself. This experience lent itself well to Pasteur’s evil plot: Revenge Beer. He began an in-depth study of the fermentation of yeast, the crafting of beer, and the microorganisms involved in creating a beer that was better tasting and longer lasting (the better for exporting). The patents he applied for on this date were but the first arrows shot in this war of brews. Over the next few years, he visited numerous non-German breweries to share his expertise, and published what would become the brewer’s bible - Études sur la bière (Studies on beer). English translation
Dedicated to his father (noting his status as soldier and Knight of the Legion of Honor) he opens the preface with the following:
"Our misfortune inspired me with the idea of these researches. I undertook them immediately after the war of 1870, and have since continued them without interruption, with the determination of perfecting them, and thereby benefiting a branch of industry wherein we are undoubtedly surpassed by Germany."
The foam on this "Bière de la Revanche Nationale" was Pasteur's commandment that his book never be translated into German. Germany appeared to have weathered the hardship well, however, so Pasteur moved on to other rivalries, most notably with the German scientist Koch over the germ theory of disease.