Had the French been successful they would have taken all the left bank of the Rhine; this was actually specified in the draft treaty which General Le Brun had presented to the Emperor of Austria.

What claim had France to be treated with a leniency which she has never shewn to any conquered enemy?
Bismarck had to meet the assumption that France was a privileged and special land; that she had freedom to conquer, pillage, and divide the land of her neighbours, but that every proposal to win back from her what she had taken from others was a crime against humanity.
So long as the Provisional Government adopted the attitude that they would not even consider peace on the basis of some surrender of territory, there was no prospect of any useful negotiations.

The armies must advance, and beneath the walls of Paris the struggle be fought out to its bitter end.

Bismarck meanwhile treated the Government with great reserve.

They had no legal status; as he often pointed out, the Emperor was still the only legal authority in France, and he would be quite prepared to enter into negotiations with him.