Well, these aren't his memoires really, more a commission he accepted (why?) and which he limited to writing about the few years he spent in the service of the Emperor of Prussia.
I think the most interesting thing about this is the fact that this book has the text on the right hand-side, and the left is taken entirely with footnotes.
And that's needed because Voltaire is VERY economical with the truth, the chronology, and the reality of his role.
Not necessary in itself, but illuminating in other ways.