As I understand it, the Waterloo campaign was a damn near run thing; let's say d'Erlon's corps, instead of sitting out the battles of Quatre-Bras and Ligny, is committed to the latter, and Napoleon envelopes Blücher's army. The British withdraw to Mont St Jean, Napoleon attacks early in the day, and crushes the British with the Prussians competently masked by Grouchy. With a forest in their line of retreat, they disintegrate. The Allied-Prussian armies are effectively neutralized for the foreseeable future.
Now Napoleon is facing three effective field armies. Two Austrian, coming through Alsace-Lorraine and northern Italy, and one Russian, following the Austrian force in northern France. Besides Napoleon's Army of the North, what field armies do the French have, and how well fortified are the French borders? Does he have a chance of defeating the Seventh coalitions initial onslaught?
Now Napoleon is facing three effective field armies. Two Austrian, coming through Alsace-Lorraine and northern Italy, and one Russian, following the Austrian force in northern France. Besides Napoleon's Army of the North, what field armies do the French have, and how well fortified are the French borders? Does he have a chance of defeating the Seventh coalitions initial onslaught?