Between 1772 and 1775 Hyacinth made two voyages as a slave ship in the triangular trade in enslaved people.

[2] 1st voyage transporting enslaved people (1772–1773): Captain James Salcraig sailed from Liverpool on 10 April 1772, bound for Bassa.

There she fired salutes and later hosted a dinner for Governor Tonyn and numerous other local gentlemen and officers of the garrison.

Tonyn had recently sailed from St. Augustine laden with turpentine, indigo, hides, and deerskins intended for Liverpool.

[10] The schooner Hero, Perry, master, sailed on 9 April for Cap-Français under a flag of truce to bring back Captain Wade and his crew.

[10] Hero returned on 26 April bringing only Wade, who had been badly wounded in the engagement with Saratoga, and Tonyn's doctor.