Many great battles that dramatically affected the course of events of the world. Reading the wonderful pb book "What If" and it piqued my mind into which SINGLE BATTLE would be most pivotal in history. D-Day? Gettysburg? Agincourt? Salamis? Teutoberg Forest? Tenochtitlan? Waterloo? Midway? Dien-bienphu? Sennacherib? I opt for Tours (Potiers) outside Paris AD 732 stopping the Moslem invasion of Europe and beginning the drive of Islam back into Africa and the Middle East. Which is yours?