In July 1839, fifty-three illegally enslaved Mende captives revolted aboard the Spanish schooner La Amistad off the coast of Cuba. Demanding to be navigated back to Africa, they were tricked by the surviving crew and driven north along the American coastline. In August 1839, the U.
S. Navy vessel Washington intercepted La Amistad off Long Island, taking the vessel and its occupants into custody. What followed was one of the most complex legal battles in maritime history, pitting international salvage law directly against anti-slavery law and international treaties.
Officers from the USS Washington claimed salvage rights over the ship, its valuable cargo, and the African captives, arguing that under traditional admiralty law, salvors were entitled to a financial reward calculated from the value of rescued property. Meanwhile, the Spanish government demanded the immediate extradition of both the ship and the Africans under the 1795 Pinckney Treaty, asserting that the captives were chattel property stolen by mutineers on the high seas. Abolitionists countered that the international slave trade had been outlawed by Spanish decree in 1820, making the captives free individuals who had exercised their natural right to self-defense against illegal kidnappers.
The case forced American courts to navigate conflicting legal domains: Could human beings be classified as salvageable maritime cargo under treaty obligations if their initial capture was illegal under international law? When the case reached the U. S.
Supreme Court in 1841, former President John Quincy Adams argued passionately for the captives. The Supreme Court ultimately ruled that the Mende were free human beings illegally enslaved, denying both the Spanish property claims and the naval officers' salvage demands.