The slave ship Union left the African coast carrying enslaved Africans toward Grenada. About 171 people had been taken aboard.

Vessel: Union; flag: Great Britain; rig: Brig; estimated standardized tonnage: 103. People recorded in connection with the voyage: Captain: McGauley James; Investor: McGauley James; Investor: Ratcliffe, John; Captain: Thompson, William; Investor: Thompson, William; Investor: Buddicom Robert. The voyage began at Liverpool on 1 August 1791. Principal recorded place where captives were acquired: Bight of Benin, place unspecified. Principal recorded disembarkation place: Grenada, place unspecified. Recorded outcome: Voyage completed as intended.