Theoretically the Prussians could have marched straight towards Paris unopposed , but this course was never seriously considered : the threat to their lines of supply and communication was too great to be ignored .
The French forces were now east of the Prussians , behind their lines .
Theoretically the Prussians could have marched straight towards Paris unopposed , but this course was never seriously considered : the threat to Prussians ' lines of supply and communication was too great to be ignored .
The French forces were now east of the Prussians , behind their lines .