Quote Originally Posted by Fate
For me it's probably the siege of Badajoz in the Ilberian war.

The strength and determination of the defenders made it a bloody attack for the redcoats, and it was a huge historical turning point. If the defenders had held out, and beaten the brits, the napoleons forces would have been able to push the brits back to portugal, and eventually back onto ships to britain.

Europe could have been a VERY different place if that siege had gone the other way.
Yeah, that battle was the beginning of the end for Napoleon's empire. Good one, I hadn't thought of that.