On the first of these her non-European crew suffered a high mortality rate on the voyage back to India.

Under the command of Captain James Carnegy (or Carnageie), Mornington left Calcutta on 30 December 1799.

She was at Saugor on 23 January 1800, reached St Helena on 8 June, and arrived at The Downs on 9 September.

[9] On 14 January 1801 HMS Argo was off Ferrol serving as escort for Mornington, Eliza Ann, and Exeter, which were bound for India, and a whaler.

[9] Arran and Exeter left England at the same time as Mornington and experienced similar mortality results.

[8] The "United Company of Merchants of England trading to the East Indies" offered 28,966 bags of rice for sale on 25 March.

[11] Mornington entered Lloyd's Register in the supplemental pages to the 1802 volume with "Kelsa", master, and "Fairly", owner.

She left Bengal on 5 July in company with the country ship Anna, and Maria, Northampton, and Princess Mary.

[1] On 27 February 1816, Lloyd's List reported that Mornington, Dunlop, master, had been burnt in the Bay of Bengal.