Herding? Those guys are the wizards! Don't you see the customary long-wands they are wielding? They sweep them over the ducks to give them bonuses to all sorts of attributes, do mass heal spells, etc. The ducks themselves are the elite infantry that make up the bulk of the forces. And the motorized bike division are providing support (they're sort of like chariots... rush ahead, attack, fall back, repeat). You are doomed! Er... I mean banned!