The Prussians retreat, leaving the French in possession of Brunswick
They do so to recreate the “no mans land” square between then and the French
The French redeploy to ensure that there is only one corps in each square
Napoleon has secured the main campaign objective of holding Brunswick
However they have not destroyed the Prussians, which is their secondary objective
The Onus is now on Blucher to regroup and attempt to retake Brunswick
If he is unable to do so the French will have won this phase of the campaign.