Union was launched in 1791 in Liverpool, England.

Captain R. Farrington sailed for West Africa on 15 August 1792.

[1] Captain George Hauit acquired a letter of marque for Union on 1 March 1793,[2] just after the outbreak of war with France.

The French privateer Liberty, of Bordeaux, captured seven slave ships before July 1793: Union, Farrington, Little Joe, Echo, Mercury, Hazard, Prosperity, and Swift, Roper, master.

The capture of Union took place off Bassa.