The slave ship Duchesse de Grammont left the African coast carrying enslaved Africans toward Haiti. About 568 people had been taken aboard.

Vessel: Duchesse de Grammont; flag: France; estimated standardized tonnage: 453.1. People recorded in connection with the voyage: Investor: de La Villegille; Investor: La Lande Magon; Captain: Corbillé, J-Fr. The voyage began at Saint-Malo on 14 April 1770. Principal recorded place where captives were acquired: Cabinda (West Central Africa and St Helena). Principal recorded disembarkation place: Cap Français. Recorded duration of the captives' Atlantic crossing: 263 days. Estimated mortality during the crossing: 5.0%. Recorded outcome: Voyage completed as intended.