During this period she took part as a transport in two military campaigns, the cancelled attack on Manila in 1797, and the capture of Mauritius in 1810.

Sir Stephen Lushington reached the Cape of Good Hope on 18 November and Madras on 17 February 1797.

[7] Homeward bound, Sir Stephen Lushington was at Saugor on 23 December, Madras on 4 February 1798, and the Cape on 23 April.

[2] She arrived at the Downs on 24 September, together with 15 other East Indiamen that had left St Helena on 22 July, all under escort by HMS Madras.

Sir Stephen Lushington reached Madras on 26 July and arrived at Diamond Harbour on 21 August.

Sir Stephen Lushington reached Rio de Janeiro on 13 November and the Cape on 16 January 1807.

Homeward bound, she was at the Cape on 1 October, reached St Helena on 24 November, and arrived at the Downs on 27 January 1808.

[2] EIC voyage #7 (1810-1811): Captain Hays sailed from Portsmouth on 14 March 1810, bound for Bombay and Madras.

[2] For the invasion of Île de France (Mauritius) the British government hired a number of transport vessels, Sir Stephen Lushington among them.

Sir Stephen Lushington was, in fact, one of several vessels that agents in British and French ports of the Spanish government had chartered to carry troops or supplies to the Royal forces in Peru.