Bismarck wrote to the Comte d'Arnim on November 11, 1871:

We must desire the maintenance of the republic in France for one last reason which is major. Monarchical France was and will always be Catholic. His policy gave him great influence in Europe, in the East and even in the Far East. One way to thwart its influence for the benefit of ours is to lower Catholicism and the papacy which is its head. If we can achieve this goal, France is forever annihilated. The monarchy would hinder us in this attempt. The radical republic will help us. I am undertaking a war against the Catholic Church which will be long and perhaps terrible. I will be accused of persecution. But it is necessary to lower France and establish our religious and diplomatic supremacy as well as our military supremacy.