I want to know the answer to the following question:
On what date did Bismarkck receive the disturbing report on the Posen situation?
All the background I'm provided with is that "The Franco-Prussian War thus turned out to be a significant event also in German–Polish relations, marking the beginning of a prolonged period of repressive measures by the authorities and efforts at Germanisation.". Is that enough to answer the question?
Answer: no