The slave ship Marie Heureuse left the African coast carrying enslaved Africans toward Martinique. About 230 people had been taken aboard.

Vessel: Marie Heureuse; flag: France; estimated standardized tonnage: 272.3. People recorded in connection with the voyage: Investor: Richer de Lahaye, Olivier; Captain: Denis, Guillaume. The voyage began at Nantes on 27 August 1749. Principal recorded place where captives were acquired: Whydah, Ouidah (Bight of Benin). Principal recorded disembarkation place: Martinique, place unspecified. Recorded duration of the captives' Atlantic crossing: 142 days. Estimated mortality during the crossing: 36.0%. Recorded outcome: Voyage completed as intended.