Jackson paid $150 for the services of his cook Jim Lewis during the war. There is much ambiguity whether the $150 was the price to purchase Jim from his owner, or if those were Jim's wages.
There's another possibility that General Jackson rented Lewis. That often happened, and if so it would be true that Jackson didn't own Lewis. If he habitually rented servants, then he might never have actually owned slaves. Which is a distinction without a difference, when the question is whether Jackson participated in the peculiar institution.
Anyone know whether Lewis is the slave Jackson is depicted as speaking to about slavery and the future in Gods and Generals?