Well Oliver found it in Mac Donald's Memoirs, here's what he said:

"Thanks ! Seems to be taken from Macdonald's Souvenirs (1892, p.160):

Wrede, who had just been wounded: Dites à l'Empereur que je meurs pour lui; je lui recommande ma femme et mes enfants.

Macdonald: Mais il me semble que vous pourrez lui faire cette recommandation vous-même, et, de plus, faire encore des enfants à votre femme.

Macdonald was right. Luckily, the wound turned out to be unimportant."

So you are implying Mac Donald lied without providing any proof of that. I thought the matter was resolved in the original thread since you seemed to agree with Susan.