Not sure there's a vignette to point you towards Harry
But Warlord Games has a Greek Hoplite casualty pack that has a figure lying on his shield that may be useful,the guys carrying the shield may have to be made out of some upright spear carrying minis though.
Not too difficult a conversion I should imagine
Sorry can't do links I'm afraid but if you Google 28mm Hoplite casualties I'm sure images of the pack will appear.
Good luck
Cheers
Keith