Yellow fever
For a few months, the island was quiet under Napoleonic rule. But when it became apparent that the French intended to re-establish slavery (because they had nearly done so on Guadeloupe), black cultivators revolted in the summer of 1802. Yellow fever had decimated the French; by the middle of July 1802, the French lost about 10,000 dead to yellow fever. By September, Leclerc wrote in his diary that he had only 8,000 fit men left as yellow fever had killed the others.