She also made one voyage to St Helena from Bengal under charter to the British East India Company (EIC).

In 1810 Portsea was one of a large number of vessels that the British government chartered as transports to support the invasion.

The British government chartered some nine of these vessels, Portsea among them, as cartels to carry back to France the French troops that they had captured in these campaigns.

[8] Portsea, Hogue, Davidson, & Co., owners, appeared in a list of vessels registered at Calcutta in January 1811.

Portsea left Spithead with the 1st Battalion soldiers of the 60th Regiment of Foot[9] on board that were transferred from Cowes on 30 May 1811 to the Cape of Good Hope and arrived on 18 September 1811.

[10] On her way back from delivering the prisoners, Portsea, Burgh, master, was at the Cape of Good Hope on 15 October 1811.

[11] On 12 November 1812 Portsea, sailing from Bengal, left St Helena in the company of some whalers, all bound for England.

[13] On 13 September 1814, Lloyd's List reported that Portsea, from London to Bengal, had put into Ceylon totally dismasted.

[18] A letter dated St Jago de Chili 12 December 1817, reported that Portsea, Nichols, master, had arrived at Valparaiso from Bengal via Port Jackson with 1200 bales of piece good, valued at 300,000 dollars.

Lloyd's Register for 1837 reports that she underwent small repairs in 1837, and gives the name of her master as Woodward and that of her owner as Waddell.

[3] On 8 August 1838, Portsea, Captain Samuel John Lowe, sailed from Plymouth with convicts, bound for New South Wales.

[22] The PSNC purchased the 485 tons of coal that Portsea carried from the Cwm Vale Colliery, Llanely.