On her fourth voyage, she and five other vessels bombarded Calabar for more than three hours to force the local native traders to lower the prices they were charging for slaves.

1st slave voyage (1788–1789): Captain Alexander Nicholson sailed from Liverpool on 28 February 1788, bound for West Africa.

[3] 2nd slave voyage (1789–1790): Captain Thomas Huson sailed from Liverpool on 7 September 1789.

She sailed from Africa on 12 September and arrived at Montego Bay on 26 November with 242 slaves.

[6] 4th slave voyage (1792–1793): Captain Thomas Taylor sailed from Liverpool on 20 April 1792.

The bombardment by some 66 guns killed and wounded 50 or so of the local inhabitants and resulted in the traders agreeing to the prices the captains offered.

[8][a] Martha sailed from Africa on 30 August and arrived at Kingston, Jamaica on 14 November.

Martha sailed from Jamaica on 14 December and arrived back at Liverpool on 31 January 1793.

[7] 5th slave voyage (1794–1795): Captain Thomas Harold acquired a letter of marque on 3 January 1794.

Martha left Africa on 18 February 1795 and arrived at Barbados on 19 March.

[10] 7th slave voyage (1798–1799): Captain Thomas Harold sailed from Liverpool on 8 June 1798.

[11] 8th slave voyage (1799–1800): Captain Taylor acquired a letter of marque on 23 April 1799.

[12] 9th slave voyage (1799–1800): Captain Phillip Henshall acquired a letter of marque on 21 April 1800.

In October, Lloyd's List reported that Martha, Yates, master, had been wrecked at the Caicos.