The inspiration for Sacré Cœur's design originated on September 4, 1870, the day of the proclamation of the Third Republic, with a speech by Bishop Fournier attributing the defeat of French troops during the Franco-Prussian War to a divine punishment after "a century of moral decline" since the French Revolution, in the wake of the division in French society that arose in the decades following that revolution, between devout Catholics and legitimist royalists on one side, and democrats, secularists, socialists and radicals on the other. This schism in the French social order became particularly pronounced after the 1870 withdrawal of the French military garrison protecting the Vatican in Rome to the front of the Franco-Prussian War by Napoleon III, the secular uprising of the Paris Commune of 1870-1871, and the subsequent 1871 defeat of France in the Franco-Prussian War.
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