The slave ship Union left the African coast carrying enslaved Africans toward Haiti. About 434 people had been taken aboard.

Vessel: Union; flag: France; estimated standardized tonnage: 272.3. People recorded in connection with the voyage: Captain: Ernaud de La Rochandière, Fr; Investor: Montaudoin, René. The voyage began at Nantes on 2 March 1728. Principal recorded place where captives were acquired: Whydah, Ouidah (Bight of Benin). Principal recorded disembarkation place: Cap Français. Recorded duration of the captives' Atlantic crossing: 177 days. Estimated mortality during the crossing: 60.0%. Recorded resistance: Revolt by enslaved people. Recorded outcome: Voyage completed as intended.