This question is too vague, and needs more information. The only battle that really affected the victors was when Napoleon was finally defeated at the Battle of Waterloo, 1815.
Napoleon lost the Battle of Waterloo to the Seventh Coalition.
The Battle of Austerlitz
The Battle of Waterloo.
The Battle of Waterloo.
The Battle of Lodi.
he did not weaken France but his last battle was the battle of Waterloo he weaken France then because he lost the battle of Waterloo so it was the end of napoleon at the battle.
Waterloo.
The Battle of Waterloo.
At the Battle of Waterloo.
The Battle of Wavre was a battle in the seventh coalition against Napoleon I.
Battle of Friedland
The Battle of Waterloo.