[2] She began her second cruise on 4 June, departing from Savannah and proceeding to the Grand Banks and along the coasts of Ireland and Spain, capturing 14 British merchant ships.

Throughout June in the Sunda Strait of the Dutch East Indies the Peacock captured three merchantmen, Brio del Mar of Batavia, Union of Calcutta, and the Venus.

[8] The crew of Peacock burnt the Brio del Mar and Union and converted the Venus into a cartel to carry her prisoners.

Because the captures occurred after the formal end of the conflict, the Phoenix and Star insurance companies of Calcutta applied to the U.S. government for compensation.

[10] On 30 June 1815 the Peacock captured the British East India Company brig HCS Nautilus in the Straits of Sunda during the final naval action of the war.

[11] Warrington claims to have suspected a ruse, although the journals of his officers note his knowledge about the Treaty of Ghent prior to encountering the Nautilus.

When Boyce provided documents proving that the Treaty of Ghent ending the war had been ratified, Warrington released his victims.

On 3 June 1822, the Peacock became the flagship of Commodore David Porter's West India Squadron, which was tasked with rooting out piracy in the Caribbean.

Cases of "malignant fever" were reported among crew members of Peacock in September 1822, which eventually necessitated a recess from anti-piracy activities.

On 31 October 1822, Captain Stephen Cassin wrote to Secretary of the Navy, Smith Thompson, confirming the yellow fever outbreak on the Peacock.

In early 1826 the Peacock accompanied the USS United States under the command Issac Hull across the Pacific coast of South America.

[18] The Secretary of the Navy, Samuel L. Southard, had sent orders to Hull for the exploration of Pacific islands, the establishment of treaties with native rulers, and the protection of American commercial and whaling interests.

Feeling events in South America necessitated his presence, Hull sent Jones and the Peacock to fulfill the directives in late May 1826.

After sailing around Cape Horn, it visited Rio de Janeiro on 11 August, before reaching New York City in late October 1827.

Following refit, both the Peacock and the newly commissioned 10-gun schooner USS Boxer were ordered to assist the frigate Potomac, which had just sailed on the first Sumatran Expedition.

[25] Also aboard was President Andrew Jackson's "special confidential agent" Edmund Roberts in the official status of Captain's clerk.

It nearly threw the Peacock on her beam ends, completely overwhelmed the gig in the starboard-quarter, crushed it, and buried the first three ratlines of the mizen-shrouds under water.

On the eastern side of the island hot springs boiled furiously through many fathoms of water one hundred and fifty feet from shore.

With the onset of the winter northeast monsoon and no sign of the Boxer, the Peacock sailed from Nei Lingding Island in the Pearl River estuary.

Contrary winds from the northwest rather than the expected northeast quarter, coupled with a strong southward current, caused her to lose ground on every tack.

The mission first sailed to Brazil, then round the Cape of Good Hope to Zanzibar, for Roberts to return ratifications of the two treaties.

The crew heaved overboard eleven of the twenty-two guns, re-floated the ship on the 23 September, and repelled Arab marauders before making sail the next day.

[38] Peacock later obtained this letter:[39]I certify that during the period I have navigated the Arabian coast, and been employed in the trigonometrical survey of the same, now executing by order of the Bombay government, that I have ever found it necessary to be careful to take nocturnal as well as diurnal observations, as frequent as possible, owing to the rapidity and fickleness of the currents, which, in some parts, I have found running at the rate of three and four knots an hour, and I have known the Palinurus set between forty and fifty miles dead in shore, in a dead calm, during the night.

It is owing to such currents, that I conceive the United States ship of war Peacock run aground, as have many British ships in previous years, on and near the same spot; when at the changes of the monsoons, and sometimes at the full and change, you have such thick weather, as to prevent the necessary observations being taken with accuracy and the navigator standing on with confidence as to his position, and with no land in sight, finds himself to his sorrow, often wrong, owing to a deceitful and imperceptible current, which has set him with rapidity upon it.

To sailing master, John Weems, U. S. Navy.A second attempt at negotiating with Đại Nam failed as Roberts fell desperately ill of dysentery; he withdrew to Macao where he died 12 June 1836.

Exploring Expedition visited the budding port of Sydney,[45] with its diverse social milieu described by historian William R. Stanton:"At the Jolly Sailors Inn there were separate tables for the English who drank their 'alf and 'alf out of pewter mugs and sang "Rule Britannia," the French, who took their claret in thin glasses and roared the "Marseillaise," the Russians, who with the Americans drank "something harder" and sang something incomprehensible, and of course the Americans, who treated all to an occasional round of "Yankee Doodle."

According to William Reynolds a staged ceremony was held for the visiting Fijians, with Saules a part of the ruse:[52]"[Ro Banuve] was honored with one roll and a half of the drum, instead of three, the black steward of my mess, who flourished the sticks, breaking down in the middle of the second, so that this part of the show terminated in several abortive squeaks of the fife breathed by the Ship’s Cook.

[50] While the American officers promised to not execute him, they insisted on taking Ro Veidovi back to East Coast of the United States.

Its personnel were served "worm-infested bread, a daily pound of yams per man, and stinking beef that resembled mahogany.

[65] The beleaguered Peacock crew was given aid by James Birnie and John McLoughlin of the Hudson's Bay Company and Clatsop Mission members Joseph H. Frost and Henry W. Kone.