Prior to world war i, the established that, in case of the outbreak of war, germany would attack france first and then russia.

Schlieffen Plan, Germany would quickly deal with France then send the majority of German troops to fight Russia

The  franco-prussian  war, a  war  that was  led by prussia a coalition of  german  states, defeated  france. the  war  was the end  of  french  hegemony in europe and resulted in a unified  germany.  i hope this !