[2] A month later he was promoted to Lieutenant and moved to the much smaller HMS Scout under Captain William Ramsden based in the Mediterranean.
[4] There in May 1824 he caught "jungle fever" on an expedition to resolve water supply to Rangoon with a fleet assembled at Port Cornwallis on the Great Andaman Island.
[5] In June 1824 still on HMS Larne he took part in a skirmish en route from Rangoon to Kemmendine and showed great gallantry and on 10th commanded a small fleet against native attacks.
On 8 July he commanded HMS Satellite accompanied by a body of troops under Sir Archibald Campbell on a trip inland on the Yangon River.
By mid September the crew of the Larne were heavily affected by scurvy and Marryat ordered the ship to Penang for recovery.
On 17 Feb he sailed the Larne accompanied by the East Indiaman Mercury and the transporter Argyle with 780 troops under Major Robert Sale and attacked Bassein on the Irrawaddy River.