Short answers, pulled from the story.
The Saint-Domingue expedition was a large French military invasion ordered by Napoleon Bonaparte and led by his brother-in-law General Charles Leclerc, aimed at reasserting French control over the Caribbean colony of Saint-Domingue. The fleet departed in December 1801 and French troops left the island in December 1803 after a decisive defeat.
France landed a total of 31,131 troops on Saint-Domingue, drawn from nearly all units of the French Revolutionary Army, a Dutch division, the 3rd Polish Half-Brigade, and supported by a Spanish fleet of seven ships under Admiral Federico Gravina. Fewer than 7,000 to 8,000 of those soldiers survived.
Toussaint Louverture was a black former slave whom France had recognised as governor of Saint-Domingue. Napoleon decided to remove him after Toussaint promulgated a self-rule constitution on the 12th of July 1801 naming himself governor for life, which Napoleon interpreted as an unacceptable challenge to French imperial authority.
Yellow fever killed around 15,000 French soldiers in only two months, while mass defections of black and mulatto troops eroded the army from within. By October 1802, former rebel leaders including Dessalines, Christophe, and Pétion had all deserted the French, leaving fewer than 10,000 effective soldiers to face the renewed revolt.
General Leclerc died of yellow fever on the 1st of November 1802 while taking refuge on the island of Tortuga. His wife Pauline Bonaparte, Napoleon's sister, had accompanied him to Saint-Domingue and cut off her hair after his death, placing it in his coffin and preserving his heart in an urn.
Jean-Jacques Dessalines defeated the French at the Battle of Vertières on the 18th of November 1803, and on the 1st of January 1804 proclaimed Haiti the second independent state in the Americas. France lost more troops in Saint-Domingue than at the later Battle of Waterloo, and Napoleon abandoned his goal of a French empire in the West.