By: History.com Editors

Trent Affair

The Union Naval vessel 'San Jacinto' captures two Confederate commissioners traveling on the British mail steamer 'Trent' from Havana to Europe during the American Civil War.

MPI/Getty Images

Published: November 09, 2009

Last Updated: February 27, 2025

The Trent Affair was a diplomatic crisis that took place between the United States and Great Britain from November to December 1861, during the U.S. Civil War (1861-65). The crisis erupted after the captain of the USS San Jacinto ordered the arrest of two Confederate envoys sailing to Europe aboard a British mail ship, the Trent, in order to seek support for the South in the Civil War. The British, who had not taken sides in the war, were outraged and claimed the seizure of a neutral ship by the U.S. Navy was a violation of international law. In the end, President Abraham Lincoln’s administration released the envoys and averted an armed conflict with Britain.

The Trent Affair: Confederate Envoys Arrested

On November 8, 1861, Confederate diplomatic envoys James Mason (1798-1871) of Virginia and John Slidell (1793-1871) of Louisiana were aboard the Trent, a British mail steamer, sailing through the Bahama Channel (between the Bahamas and Cuba), when the vessel was intercepted by the USS San Jacinto, captained by Charles Wilkes (1798-1877). Mason and Slidell and their secretaries, who were headed to England and France to lobby for recognition of the Confederacy, were arrested, transported to Boston and imprisoned at Fort Warren. The Trent was allowed to continue its journey after the men’s arrest.

Did you know?

Years before he was involved in the Trent Affair, Captain Charles Wilkes commanded the U.S. Exploring Expedition of the Pacific Ocean and surrounding areas, from 1838 to 1842. The expedition is credited with discovering that Antarctica is a separate continent.

In America, Northerners hailed Captain Wilkes for actions. However, the British were outraged when word of the interception reached London in late November. They had not taken sides in the Civil War and their policy was to accept any paying customer who wished to travel aboard their ships. The British government dispatched a message to the American government demanding the release of Mason and Slidell, along with an apology for the transgression of British rights on the high seas.

The Trent Affair: Britain Prepares for War

The British began preparing for war, banning exports of war materials to America and sending troops to Canada. Plans were made to attack the American fleet that was blockading the South. The British also planned a blockade of Northern ports. At the same time, France announced it would back Britain in a conflict with America.

American Civil War History

If you had just one word to describe the Civil War, what would it be?

The Trent Affair: Crisis Resolved

In December, Lord Lyons, the British minister to the United States, met with Secretary of State William Seward (1801-72) concerning the fate of Mason and Slidell. Lyons took a hard line during the meeting, and afterward wrote to Lord Russell, the British foreign minister: “I am so concerned that unless we give our friends here a good lesson this time, we shall have the same trouble with them again very soon. Surrender or war will have a very good effect on them.”

Abraham Lincoln (1809-65) and his administration got the message—“One war at a time,” the president said—and decided not to push the issue. On December 27, Seward sent a message to Britain officials in which he disavowed the actions of Captain Wilkes and announced that the envoys would be released. Armed conflict with Great Britain thus was averted.

After Mason and Slidell were set free in early January 1862, they traveled to Europe. However, their mission ultimately was a failure, as they were unable to convince European leaders to support the Confederates in the Civil War.

Related Articles

About the author

HISTORY.com works with a wide range of writers and editors to create accurate and informative content. All articles are regularly reviewed and updated by the HISTORY.com team. Articles with the “HISTORY.com Editors” byline have been written or edited by the HISTORY.com editors, including Amanda Onion, Missy Sullivan, Matt Mullen and Christian Zapata.

Fact Check

We strive for accuracy and fairness. But if you see something that doesn't look right, click here to contact us! HISTORY reviews and updates its content regularly to ensure it is complete and accurate.

Citation Information

Article title
Trent Affair
Website Name
History
Date Accessed
March 21, 2025
Publisher
A&E Television Networks
Last Updated
February 27, 2025
Original Published Date
November 09, 2009

History Revealed

Sign up for "Inside History"

Get fascinating history stories twice a week that connect the past with today’s world, plus an in-depth exploration every Friday.

By submitting your information, you agree to receive emails from HISTORY and A+E Global Media. You can opt out at any time. You must be 16 years or older and a resident of the United States.

King Tut's gold mask