Licensed as a privateer by the United Provinces to seize Spanish ships, he was later accused of piracy following the seizure of American and Portuguese flagged vessels.

Jewett finished his career in the Imperial Brazilian Navy, serving under Lord Cochrane and died in Rio de Janeiro in 1842.

Its first mission was to escort the provisions ship Charlotte from New York to the West Indies, replenishing the American Squadron operating against the French.

Following the end of hostilities with France as a result of the Treaty of Mortefontaine, Trumbull returned to the United States in the spring of 1801, was sold later that year and her crew discharged.

He offered his services to the newly independent United Provinces of the River Plate (later Argentina), which accepted his proposal and authorized his corsair activities against the Spanish.

From 1815 to 1817 the Invincible made use of the letter of marque issued for her and Jewett, and four ships were captured: the polacca Tita, the frigate Santander, the brigantines Jupiter and San Antonio, all of them deemed lawful prize by the Government of the United Provinces.

Jewett's activities were licensed by letter of marque that Lynch obtained from the Buenos Aires Supreme Director José Rondeau.

[citation needed] In March 1820 he set out on a voyage marked by misfortune, a mutiny, scurvy and piracy against Portuguese and American ships.

Weddell reports the letter he received from Jewett as: Sir, I have the honour to inform you of the circumstance of my arrival at this port, commissioned by the supreme government of the United Provinces of South America to take possession of these islands in the name of the country to which they naturally appertain.

As your views do not enter into contravention or competition with these orders, and as I think mutual advantage may result from a personal interview, I invite you to pay me a visit on board my ship, where I shall be happy to accommodate you during your pleasure.

I have the honour to be, Sir Your most obedient humble Servant, Signed, Jewett, Colonel of the Navy of the United Provinces of South America and commander of the frigate Heroína.

"[8] Weddell also linked the ceremony to Jewett's claim to the wreck of the Uranie and comments that it was calculated to make an impression on the masters of ships in the area.

[15] In 1823, while under the command of Lord Cochrane (the Sea Wolf), Jewett held the rank of “Chefe de Divisão” and fought in the northern provinces of Brazil, then still sympathetic to Portugal.

[16] Jewett was accused of misconduct, whilst in command of the ship Pedro I, and sentenced by the Supreme Military Court to 2 years of imprisonment, on May 20, 1824.