Please answer a question about the following article about Franco-Prussian War:

The quick German victory over the French stunned neutral observers, many of whom had expected a French victory and most of whom had expected a long war. The strategic advantages possessed by the Germans were not appreciated outside Germany until after hostilities had ceased. Other countries quickly discerned the advantages given to the Germans by their military system, and adopted many of their innovations, particularly the General Staff, universal conscription and highly detailed mobilization systems.

What stunned neutral observers about the end of the war?
The quick German victory