Can you expand the question? I'm not really sure what it is you're asking.

What you're probably looking for is the fighting manuals, which describe how the author thought fighting was best. These manuals typically only cover dueling, so they may not be quite as accurate for how fighting was done in battles, but with your analogy to boxing, this seems more like what you're looking for. It should also be noted that in that case, the shield was, to my understanding, not something common in a dueling enviroment, the most you would have is a buckler or parrying dagger, and all this depends on when and where you lived.

Now I can't say if different styles emerged contemporary to one another, but over time, the way people fought obviously changed, in adddition to change over location. I'd suggest looking into these manuals to see specifics on the differences over time and place. You can find a list of them here:http://wiktenauer.com/wiki/Treatises