What kind of music do you imagine when you hear "The Great Battle"? Happy? Sad? Dangerous? Depends who wins, right? I have experienced a total of zero real battles in my lifetime, so I'm in no way capable of knowing how to write music to it.
But if I had to guess, it would sound something like this.
At least I'm sure it would fit most epic battle scenes, if you're currently making one. OR, if you're like me, just listen to it to feel a bit more awesome for 3+ minutes.