Some six months ago we used to have two topics about 20th and 19th century so why not go further.
.Most significant battle of the 20th century
Most significant battle of the 19th century
I have few candidates
1. Poltava 1709 and Decline of Sweden and the Rise of RussiaAs the result Russia gets his "window to Europe" and Europe will never be the same.
2. Plassey 1757 and ce 200 years of British domination on the Indian subcontinent.
3. Saratoga 1777 the American colonies prove to be worthy of investment- French subsidies follow. France gets involved deeper and deeper in a war she can not afford to fight. A new republic in the New World rises from the ruins of old Europe.
4. Valmy 1792 Young revolution is saved - national guard defeats the best soldiers the old Europe.
So what do you think, I do not have a clear favourite this time.