I want to know the answer to the following question:
Where did the quickly mobilised troops first invade in France?
All the background I'm provided with is that "According to some historians, Bismarck adroitly created a diplomatic crisis over the succession to the Spanish throne, then edited a dispatch about a meeting between King William of Prussia and the French ambassador, to make it appear that the French had been insulted.". Is that enough to answer the question?
Answer: no