[3] Voyage transporting enslaved people (1775–1776): Captain William Hamilton sailed from London on 8 September 1775, bound for West Africa.

Union acquired captives first at the Sierra Leone estuary and then at the Îles de Los.

Union departed Africa on 14 November, reached Grenada, and then sailed for Jamaica on 12 December.

On the letter Hamilton declared that Union was carrying provisions for His Majesty's forces.

[a] Lloyd's List reported on 3 August 1781 that Union, late Hamilton, had been taken and carried into Hispaniola.