
Originally Posted by
Laconian
One could make an argument for a multitude of decisive defensive engagements (Chamberlain & the 20th Maine at the Little Round Top comes to mind, but is that a battle within a battle?) of the battles listed in the poll, I vote for Thermopylae for two reasons. First, the battle was decisive. The stand of the 300 Spartans (& their Greek compatriots about 8000-10000 combined forces) against nearly 275,000 - 300,000 Persians (and their armies) allowed both a sense nationalism to form a Greek alliance that would defeat Xerxes, and supplied a valuable delaying action for the forces to be mustered. So even though the Spartans, et al, are destroyed to a man (save those Leonidus sent away on the last day), they are a major contributing factor for the battle to come.
Secondly, as has been pointed out in a previous post, Thermopylae may be the pivotal battle that shaped the world. There are many historians that equate the stand at Thermopylae with saving the Western world. Imagine if Xerxes and the Persians had conquered Greece? The entire face of the world today would be different. So as far as a definitive, heard around the world battle, Thermopylae gets my vote.