Hang on, I'm not looking for an act of faith!
But I don't see a facsimile of the man's signature in the Revue d'Artillerie, v38, and I can't place much confidence in a late 19th century editor's faithfulness to early 19th century spelling nuances. Editors and historians can be very sly or careless about any era they look back on!
We English-speakers can be challenged by accents and other diacritical marks, so I am merely trying to learn and get it right.
How was the man's name spelled during his lifetime, by him?
Can anyone help?