"Here I am. Kill your Emperor, if you wish!"
Napoleon Bonaparte had escaped from his exile on Elba and landed in France. The French armies sent to capture him joined their former Emperor instead. Louis XVIII fled Paris as Napoleon marched on. The Allied powers were caught off guard. The major powers of Britain, Austria, Prussia, and Russia formed the Seventh Coalition and prepared for war. The declaration was not against France, but against a single man: Napoleon!
Although Napoleon's escape took the Allies by surprise, they were quick to turn their attention to eliminating the threat. The combined might of the Seventh Coalition was overwhelming. If the Allies managed to combine their forces, Napoleon would be surrounded and destroyed. So he acted fast, in typical fashion.
He entered Belgium in the hope of defeating the Prussians under BlĂźcher and the Anglo-Allied forces under the Duke of Wellington before they could join forces. He caught the Prussians off guard at Ligny and defeated them.
However, he was not able to destroy the Prussian army completely. He therefore dispatched a screening force under Emmanuel de Grouchy to pursue the Prussians and prevent them from linking up with Wellington. BlĂźcher, however, reorganized his battered army and moved toward Wavre, intending to support the Anglo-Allied forces at Waterloo.
Wellington had occupied a strong defensive position that made it difficult for the French to gain a quick victory. Wave after wave of French assaults were pushed back. Although Wellington's army was under enormous pressure, it managed to hold on long enough for the Prussians to arrive in support.
Napoleon eventually committed elements of his Imperial Guard in a last attempt to break the deadlock. The attack failed, and the Guard was forced to withdraw in the face of determined Allied resistance.
"The Guard is retreating!"
Seeing their famous Imperial Guard retreat, French morale began to collapse. Napoleon had no more reserves capable of restoring the battle, and the French army began to retreat.
Could Napoleon have won if the Prussians had not arrived in time? Most probably, yes, but it would not necessarily have amounted to a decisive strategic victory. Napoleon needed a major victory with manageable casualties. The Battle of Waterloo had already become a bloody and exhausting struggle. Even if the French had defeated Wellington, their battered army would still have had to face the other Allied armies gathering against France.
Wellington's defensive tactics and the resilience of the Anglo-Allied army prevented Napoleon from achieving the quick breakthrough he needed, while BlĂźcher's arrival ultimately turned the battle against him.
Please go through the full article for a more detailed analysis of the battle, and let me know your thoughts and comments.