In November 1861, the American Civil War nearly transformed into a global conflict due to a brazen naval intercept known as the Trent Affair. Captain Charles Wilkes, commanding the Union warship USS San Jacinto, learned that two Confederate envoys, James Mason and John Slidell, were aboard the neutral British mail steamer RMS Trent bound for Europe. Wilkes intercepted the British vessel, forcibly boarded it, and arrested the two diplomats, taking them to Boston as prisoners of war.
While the Northern public celebrated Wilkes as a hero, the British government viewed the seizure of passengers from a neutral ship as an outrageous violation of maritime law and an insult to national honor. Britain immediately demanded the release of the diplomats and an official apology, reinforcing its stance by dispatching 11,000 troops to Canada and putting its North Atlantic fleet on war footing. President Abraham Lincoln and Secretary of State William H.
Seward recognized the existential danger of fighting both the Confederacy and Great Britain simultaneously. Seward carefully navigated the crisis, admitting that Wilkes had acted without orders and releasing Mason and Slidell, while framing the release as compliance with traditional maritime rights. The crisis passed, averting a war that could have secured Confederate independence.