What role does a shield play?

[Jasper]

Originally posted by Jader:
I'm not convinced about katana - it's described as "one and half handed" (like broad sword) and IMO it was mostly used with both hands. Look at today's martial arts like kendo - main arm moves the sword and the hand of the secondary drives it.
One handed use don't let for finese technique (with such heavy weapon) and have sense only with second blade for parrying (and then there is no need for shield).

One handed use is still taught, even though primary duelling (e.g. kendo) usage is 2 handed. You do get extra reach one handed, can wield another weapon in the off hand (an uncommon but real style, especially if outnumbered), and one handed obviously makes more sense on horseback.

Such blades are nicely balanced, and easier to use one handed than European Hand and a Half Sword (which is a Bastard Sword, not a Broad Sword).