In a battle scene in one of Kurosawa's movies (sorry, I forget which one), a blade such as that was being wielded by three men at once. They were mowing them down horizontally, then lifting the blade over their heads, and mowing the other way. Kurosawa wasn't known to "invent" or take too many liberties with historical military technology (situations, yes), so perhaps it's not impossible. I took a screen grab at one point, so I'll post that if I get a chance this evening. I doubt they actually found much practical use, but perhaps in a time of war, anything weaponish may find blood.