1st voyage transporting enslaved people (1800–1801): Captain Francis Stowell acquired a letter of marque on 14 June 1800.

[3] 2nd voyage transporting enslaved people (1801–1802): Captain Stowell sailed from Liverpool on 24 June 1801.

[4] William acquired captives at New Calabar and stopped at São Tomé on he way from Africa to the West Indies.

[5] 3rd voyage transporting enslaved people (1802–1803): Captain Joseph Haile left Liverpool on 8 September 1802,[6] during the Peace of Amiens so he did not acquire a letter of marque.

[7] 4th voyage transporting enslaved people (1804–1805): Captain John Ainsworth acquired a letter of marque on 5 June 1804.

[4] Leigh and Ainsworth's plan was that William would arrive in New Calabar after the July–August yam harvest.

If she left the Bight of Biafra by October or November she would arrive in the West Indies in time to sell the captives during the beginning of the sugar harvest.

[8] On her return, Leigh stated that "altho this Vessel looked so very favorable at one time we fear not much profit will aris[e].

"[7] 5th enslaving voyage (1805–loss): Captain David Christie acquired a letter of marque on 5 June 1805.

[9] Spanish records report that in June 1805, Viceroy Sobremonte, of Argentina, issued two letters of marque, one for Dolores (24 guns), Currand, master, and Berro y Errasquin, owner, and one for Dromedario (20 guns), Hippolito Mordel, master, and Canuerso y Masini, owner.

In three months of cruising Dolores captured three ships and one brig, carrying a total 600 enslaved people.