Fort Mose — Where America's Underground Railroad Ran South in 1738, Two Miles North of St. Augustine's Plaza

Two miles north of the Plaza de la Constitución, you reach a wedge of salt marsh most St. Augustine visitors never see. There's a wooden state-park sign, a low building tucked into the trees, and — since May 2025 — a 39-foot reconstructed Spanish-colonial fort with a moat, the first time the structure has stood here since 1812. The sign at the entrance is small. The word it carries is not: Welcome to Freedom.

This is Fort Mose. In 1738, it was the first legally sanctioned free Black settlement in what would become the United States, more than a hundred years before the Civil War. The people who lived here got here by running south to Spanish Florida — the other Underground Railroad, the one the history books left out. And almost nobody who visits St. Augustine for the Castillo de San Marcos knows it's three minutes up the road.

The Spanish decree no Carolina planter wanted to read

On November 7, 1693, King Charles II of Spain signed a royal decree that quietly aimed a dagger at the British Carolinas. Any enslaved person from the English colonies who reached Spanish Florida, converted to Catholicism, and served four years in the colonial militia would receive their freedom and the protection of the Spanish Crown.

The first runaways had arrived before the ink dried — eight men, two women, and a three-year-old child, in 1687. The decree just made the policy official.

This was not Spanish humanitarianism. Florida was a thinly held outpost squeezed between expanding British colonies and French Louisiana. The Spanish needed warm bodies who knew the British colonies, spoke English, could fight, and had every reason to never want to be sent back. A freedom decree did that for free. By the 1730s, news of "the Spanish offer" had spread through plantations as far north as New York — whispered between slave quarters, sung into work songs.

Getting there was the hard part. The route from coastal Carolina to St. Augustine ran through cypress swamps thick with cottonmouths, through territory patrolled by Native nations in unpredictable rotation, and ahead of British slave catchers with dogs. The maroons — Spanish-French slang for runaways — walked it anyway. Hundreds made it. The Spanish baptized them, gave them new Christian names, and put muskets in their hands.

The man who escaped slavery twice, then ran the fort

The most consequential resident of Fort Mose was a Mandinga man born in what is now Gambia. The Spanish baptized him Francisco Menéndez. By the time he led a settlement, he had escaped slavery twice, fought a war against his former enslavers, learned four languages, and earned a military record that made him impossible to ignore.

He was captured young and shipped to British Carolina. He escaped, lived among the Yamasee, and in 1715 fought beside them in the Yamasee War — leading what later Spanish records call "a successful military campaign against his former masters." When the war collapsed, he kept moving south. He reached St. Augustine in the 1720s, was re-enslaved briefly under a colonial sleight of hand, sued for his freedom in Spanish court, and won.

By 1726 he was captain of the free Black militia at St. Augustine — a paid Crown commission. In 1738, when Governor Manuel de Montiano founded Gracia Real de Santa Teresa de Mose ("Royal Grace of Saint Teresa of Mose") two miles north of the city walls, he made Menéndez its civil and military leader.

What Menéndez ran was small but real. The 1759 census counted 22 palm-thatch huts, a wooden church, 37 men, 15 women, and 15 children. The men alternated militia patrols with farming. Couples married inside the community, with the Yamasee village across the marsh, occasionally with enslaved people in St. Augustine. They owned land. They paid taxes to a Spanish Crown that, by the standards of 1750, treated them as something the English colonies up the coast would not: free.

June 1740 — the Battle of Bloody Mose

Then came Oglethorpe. General James Oglethorpe, the founder of Georgia, did not love that a fortified free Black militia town sat at the southern edge of his colony's claims. In June 1740, as part of a broader siege of St. Augustine in the War of Jenkins' Ear, he marched south with British regulars and Carolina rangers and took Fort Mose almost without a fight — the residents had already evacuated to the Castillo de San Marcos behind the city's coquina walls.

The British settled in. They stayed sixteen days.

At dawn on June 14, 1740 — four in the morning, before the watch had changed — Captain Antonio Salgado led the Spanish regulars, and Menéndez led the Fort Mose militia and Yamasee auxiliaries, in a counterattack the British were not awake for. The fight was close and hand-to-hand, swords and clubs as often as muskets. Spanish dead: ten. British dead: about 75, with 34 captured. Survivors who eventually made it back to Georgia wrote of "bludgeoning, castration, and beheadings." The British, who named the engagement, called it Bloody Mose.

Oglethorpe withdrew from Spanish Florida within weeks. The siege of St. Augustine collapsed. The free Black militia from a 22-hut town outside the city walls had handed the British Empire one of its more humiliating colonial defeats. Menéndez became, in the language of one historian, the first Black war hero in the colonial record of what is now the United States.

How a free Black town disappears

The first Fort Mose was destroyed in the fighting. The community lived inside St. Augustine for the next twelve years. In 1752, the Spanish rebuilt the fort — slightly relocated, same purpose — and Menéndez and his militia moved back. By the early 1760s, an estimated 3,000 people of African descent lived in and around St. Augustine, three-quarters of them formerly enslaved — the largest free Black population in colonial North America.

Then geopolitics moved the floor. In 1763, after losing the Seven Years' War, Spain ceded Florida to Britain in the Treaty of Paris. The free Black residents of Fort Mose had a clear-eyed read on what British rule would mean for them. Almost the entire community boarded Spanish ships for Cuba. Menéndez sailed with the last fifty and died there, year and circumstance unknown. The British razed the fort. The marsh moved in.

In the 1880s, Henry Flagler — the railroad baron who built the Ponce de Leon Hotel and basically invented modern Florida tourism — dredged the area for fill to extend downtown St. Augustine. Agricultural upland became tidal wetland. By 1900, you could not have stood where Menéndez gave militia orders without standing in water. The site, and the story, were almost entirely forgotten outside a few Spanish archives and one 1927 essay by Zora Neale Hurston that nobody picked up.

The stubborn vet who started the dig

The story comes back into American consciousness because of an Air Force veteran named Jack Williams who, in the 1950s and 60s, started cross-referencing colonial Spanish maps with the marsh north of St. Augustine. When the St. Augustine Historical Society told him there was nothing there, he bought the land himself in 1968 for $10,000 and spent the next two decades digging in "the mush and the muck and the rain and the heat," in his own description, mostly alone.

In 1986, his work attracted Dr. Kathleen Deagan of the Florida Museum of Natural History and historian Jane Landers, who specialized in African American history in colonial Spanish America. From 1986 to 1988, their team excavated the second 1752 fort — clay-covered earth walls, the moat, post holes from wooden buildings inside the palisade. They pulled gunflints, flattened musket balls, brass buckles, thimbles, ceramics, burned seeds and animal bone, and a hand-made silver St. Christopher's medal probably worn by a militia soldier.

The state used eminent domain to acquire the land from Williams for $100,000 — he was bitter about the price for the rest of his life. The site was named a National Historic Landmark in October 1994, became a Florida state park, and slowly entered the country's national memory. Like the Old Seven Mile Bridge walk in Marathon, Fort Mose is one of those Florida sites where most of what physically mattered is technically gone — and the State has rebuilt just enough scaffolding for you to feel the rest.

What's actually here in 2026

For decades, the visitor experience was thin — a small museum, two boardwalks across the marsh to look at the spot where the fort used to be. Real history, distant view.

That changed last year. In May 2025, after roughly $3 million and three decades of effort by the Fort Mose Historical Society, a full-scale replica of the original 1738 earthwork fort opened on the site. It's 39 feet tall at its highest point. It has a moat. It's historically accurate down to the palisade timbers and the powder magazine. You can walk in, stand on its walls, and look out over the same salt marsh Menéndez's militia patrolled. There's no other reconstruction quite like it in the southeastern United States.

The on-site museum ($2, well worth it) displays artifacts from the Deagan excavation alongside Spanish colonial documents — including, on rotation, primary-source petitions filed by Menéndez himself in Spanish court. Ranger-led tours leave the visitor center at 10 a.m. and 1 p.m. and add the context printed placards can't.

Twice a year the place comes fully alive. Flight to Freedom, three days every February, recreates the journey of the maroons coming south — escaping families, helpful Yamasee, compassionate Spanish friars, slave catchers with dogs. Battle of Bloody Mose runs one Saturday every June (June 27 in 2026) with two reenactments of the 1740 dawn attack, period weapons demonstrations, and a Women of Mose station on the lives of free Black women in 18th-century Florida. Both events are free.

One thing to know in 2026: the boardwalks across the marsh are currently closed for repair, expected to reopen late summer 2026. The replica fort, museum, trails, and picnic area are all open. If your only reason to visit was the marsh boardwalks, push the trip to fall — otherwise, come now. The fort is the headline event; the boardwalks were always the side dish.

Planning your visit

Fort Mose is 15 Fort Mose Trail, less than three miles north of the Plaza de la Constitución — about ten minutes by car if traffic on US-1 isn't being St. Augustine traffic. There's free parking on-site. The grounds are open daily 9 a.m. to 5 p.m. The visitor center and museum are open Thursday through Monday only, also 9–5. Do not show up on a Tuesday or Wednesday and expect to get inside the museum — the gates are open, but the artifacts and ranger tours are not.

Plan ninety minutes minimum: thirty for the museum, thirty for the replica fort, thirty for the trails and the picnic area. If you can time it for a ranger tour at 10 or 1, take the tour. Bring water — the marsh side gets hot fast in summer, and there's no shade once you're out on the trails.

If you've already done the Castillo de San Marcos — the coquina-walled Spanish fort downtown that Mose's residents sheltered behind during the 1740 siege — Fort Mose is the obvious second stop. Together, they tell the actual story of colonial St. Augustine: a city defended for two and a half centuries by Spanish regulars, Yamasee auxiliaries, and a free Black militia whose captain had been born in Africa, sold to the Carolinas, and ended his life as a decorated officer of the Spanish Crown.

If you like that kind of layered immigrant history, Ybor City in Tampa is the next closest ride in Florida — a different century, a different empire (Cuban cigar makers), the same logic of a community that built something unrepeatable in a corner of the state most travelers drive past.

Florida almost lost the story to a marsh. It's back now. Go see it while the replica fort still feels new.