For as far as I can see the hole on the lower right of the picture seems rather 'round' and about 1,5cm wide so then my best guess would be grapeshot...

Cheers,
Rob

Shell fragments.
According to Hardoin's Français & Allemands: histoire anecdotique de la guerre de 1870-1871, Archambault (or, to give his full name, Archambault de Beaune) was killed by a shell burst, which removed half his head. Apparently, neither this appalling injury nor the chest wounds indicated by the damage to his cuirasse killed him immediately and he lingered until 7 August, the day after Froeschwiller (Martimprey: Historique du 9e Régiment de Cuirassiers). The holes in the cuirasse shown on the photograph are more consistent with shell splinters than with rifle fire, especially since Archambault was charging on horseback when he was hit. Archambault was leading the regiment when he was mortally wounded because the colonel, Waternau, had already been unhorsed and captured.

Wouch!

Poor man

I think this is such a good site it would be worth putting it into the Resources section.