In 1783 took place another one of those shuffles between high contracting parties by which each party thinks that he has secured the better of the bargain. England traded Florida to Spain for Jamaica. Spain traded Jamaica to England for Florida. In 1821 Spain ceded Florida to the United States, and in 1825 the name of the fort was changed from Fort St. Mark to Fort Marion in honor of General Francis Marion, of Revolutionary fame.
The Seminole War began in 1835 and continued until 1842, costing the United States two thousand lives, and forty million dollars. Fort Marion was the centre of the military operations of this conflict and it was the scene of the disgraceful episode of treachery by which Osceola and other Indian chieftains were captured. In 1838 General Hernandez, in command of the United States forces, sent word to Osceola that he would be protected if he should come to Fort Marion for talk of peace. With seventy of his followers the Indian came to the conference and was placed in irons. The prisoner was taken to Fort Moultrie, in Charleston harbor, where from much brooding and confinement he died. The same tactics were repeated in another sitting with Coacoochee, the remaining great leader of the Seminoles, and the Seminole War was ended. Coacoochee was confined in Fort Marion, where his cell is pointed out to visitors. His fate became that of an exile, for with his people he was transported to a western reservation.
During the Civil War Fort Marion had a brief flurry of excitement when the fort was seized by Southern sympathizers in 1861. It quickly fell before Federal troops, however, and had no further active part in that war.
The old fort is still government property, but its days of activity are long since past. That it will be maintained for many years as a reminder of the past is, however, well assured.