Gálvez on the Move
21 Days that Changed Louisiana and the American Revolution
September 1 — A Revolution in the Swamp
No highways. No air-conditioning. No weather radar.
On this day in 1779, Bernardo de Gálvez and his army were moving north from New Orleans through the hot, wet landscape of Spanish Louisiana. Their destination was still largely secret: the British outpost at Manchac.
The march carried soldiers through mud, mosquitoes, flooded ground and late-summer heat. Before Gálvez could defeat the British, he first had to defeat Louisiana’s terrain.
The American Revolution was coming up the Mississippi—and it was wearing muddy boots.
Follow along throughout September as we trace Gálvez’s campaign through Louisiana, one day at a time, and discover how events along the Mississippi helped shape the American Revolution.
September 2 — An Army That Looked Like Louisiana
This was not an army drawn from one country, culture or language.
As Gálvez moved north, his force included Spanish regulars, Louisiana militia, free Black soldiers, Acadians, Canary Islanders, Indigenous allies and American volunteers. More joined along the route, like the German Coast militia.
Commands may have been given in Spanish, but conversations around the campfires would have included French, English and Indigenous languages.
Louisiana’s diversity was not a footnote to this campaign. It was one of its greatest strengths.
September 3 — The Army Grew as It Marched
Gálvez did not leave New Orleans with a massive invasion force. He built one along the way.
Militiamen, Acadians and Indigenous volunteers joined the column as it passed through Louisiana settlements. What began as several hundred troops eventually grew into a force of roughly 1,400 people.
They were not simply following a Spanish governor. They were defending homes, families, trade routes and communities threatened by British control of the lower Mississippi.
This was becoming Louisiana’s campaign.
September 4 — A Hurricane Could Not Stop Them
Days before the expedition began, a hurricane struck New Orleans, damaging buildings, wrecking vessels and disrupting Gálvez’s supplies.
He could have postponed the campaign. Instead, he reorganized, gathered cattle and provisions and moved before the British could learn that Spain had entered the war.
Speed mattered. Surprise mattered even more.
Louisiana weather had altered the plan—but it had not changed the mission.
September 5 — The Secret at Manchac
By now, Gálvez’s exhausted column was approaching British-held Manchac near Bayou Manchac and the Mississippi River.
Many of the soldiers still did not know the full purpose of the expedition. Gálvez had concealed Spain’s declaration of war to prevent information from reaching the British.
Near Manchac, he finally revealed the truth: Spain and Great Britain were at war—and the men before him were about to attack.
According to contemporary accounts, the troops answered with cheers.
The secret march was now an open revolution.
September 6 — Fort Bute in Sight
Tonight in 1779, Gálvez and his troops were positioned near Fort Bute, the British post commonly called Fort Manchac.
Most of the British garrison had already withdrawn toward Baton Rouge, but the fort still guarded an important route between British West Florida and the Mississippi.
Gálvez surrounded the position under cover of darkness. His men were tired, sick and far from New Orleans—but surprise was still on their side.
At sunrise, Louisiana’s first major action in Gálvez’s Gulf campaign would begin.
September 7 — The Battle of Manchac
Before dawn on September 7, 1779, Gálvez attacked.
His troops rushed Fort Bute at Manchac and quickly overwhelmed its small British garrison. One defender was killed and approximately twenty were captured.
Militarily, Fort Bute was modest. Psychologically, it was enormous. Gálvez’s weary army had survived the march, maintained its secrecy and won its first victory.
The road toward Baton Rouge was now open.
Louisiana had struck its first blow in Gálvez’s Mississippi campaign.
September 8 — Victory Reaches New Orleans
News traveled downriver today in 1779: Gálvez had captured Manchac.
New Orleans officials received word of the victory as the city formally confronted the reality that Spain and Britain were at war.
At Fort Bute, Gálvez’s troops rested, treated the sick, secured prisoners and prepared for a much more dangerous opponent.
Fifteen miles away stood Baton Rouge’s Fort New Richmond—with stronger walls, more artillery and hundreds of defenders.
Manchac had been the opening move. Baton Rouge would be the real test.
September 9 — Rest Is a Weapon
Armies do not run on courage alone.
Today in 1779, Gálvez remained in the Manchac area preparing for the next phase of the campaign. Food had to be gathered. Ammunition had to stay dry. The sick and exhausted had to recover—or be left behind.
The next British position was considerably stronger than Fort Bute. A reckless attack could destroy everything Gálvez had accomplished.
Sometimes the most important decision a commander makes is knowing when not to fight.
September 10 — Two Battles, Two Louisiana Fronts
While Gálvez and his army were in the Manchac-to-Baton Rouge corridor, another fight erupted far to the east on Lake Pontchartrain.
Continental Navy Captain William Pickles approached the British vessel West Florida under British colors. At close range, his crew lowered the disguise, raised the American flag, fired and threw grappling lines across the water.
The crews fought at close quarters. After roughly twenty violent minutes, the British vessel was captured.
Gálvez was not physically aboard either ship—but the naval victory supported the same campaign to break British power around New Orleans.
September 11 — The Final Miles to Baton Rouge
With Fort Bute behind them, Gálvez’s troops began covering the final miles toward Baton Rouge.
The march was short on a modern map—approximately fifteen miles—but difficult for an army moving artillery, ammunition, animals, supplies and sick men through Louisiana’s late-summer landscape.
Ahead stood a fort designed to resist a serious attack. Behind them stretched a fragile supply line back to New Orleans.
Every mile north carried Gálvez farther from safety and closer to the campaign’s defining battle.
September 12 — Baton Rouge
Today in 1779, Gálvez’s army reached Baton Rouge.
What they saw was intimidating: Fort New Richmond was protected by a stockade, a wide ditch, artillery and hundreds of British, German and militia defenders.
The march had taken a severe toll. Illness, heat and exhaustion had left many of Gálvez’s original troops unable to fight.
A direct assault across open ground could become a disaster.
The young governor had reached Baton Rouge. Now he had to outthink it.
September 13 — The Fort That Could Not Be Rushed
Gálvez studied Fort New Richmond and quickly recognized the problem.
The British held the stronger defensive position. Their cannon could sweep the open approaches, and the surrounding ditch made a sudden charge extremely dangerous.
Gálvez had fewer artillery pieces and could not afford to sacrifice his multicultural army in a dramatic but wasteful attack.
His solution would rely on patience, engineering and deception.
Baton Rouge would not be won by charging the front gate.
September 14 — More Than Soldiers
Gálvez’s camp outside Baton Rouge contained more than uniforms and muskets.
It included interpreters, guides, laborers, cattle handlers, artillery crews and people responsible for transporting powder, food and equipment. Free Black soldiers and marksmen served alongside Spanish regulars, Louisiana militia, Acadians, Indigenous allies and American volunteers.
Every person had a role in keeping the expedition alive.
The history of victory belongs not only to the commander—but to the hundreds of people who carried the campaign forward.
September 15 — The Mississippi Was the Prize
Why did Baton Rouge matter?
The answer flowed beside the battlefield: the Mississippi River.
Control of British posts at Manchac, Baton Rouge and Natchez threatened New Orleans and restricted movement along one of North America’s most important transportation routes.
Capturing Baton Rouge would help remove British power from the lower Mississippi and protect the supply network that connected New Orleans with supporters of the American Revolution upriver.
This was not simply a fight for one fort. It was a fight for the river.
September 16 — Turning the Landscape into a Weapon
Gálvez could not change the strength of Fort New Richmond—but he could change where the British looked.
Trees, gardens, uneven ground and wooded areas surrounding the fort offered opportunities to conceal movement. Gálvez began developing a plan that would use noise and visible construction to attract British attention while his principal artillery position was prepared elsewhere.
The landscape that had tormented his army during the march could now help protect it.
In Louisiana, even the terrain could be recruited.
September 17 — The Human Side of the Campaign
The men outside Baton Rouge had already spent weeks away from their homes.
Some were professional soldiers. Others were farmers, tradesmen, hunters, boatmen or recent immigrants. Acadian participants carried memories of displacement by the British. Free men of color served in a society that recognized their military value while denying freedom to many others.
Indigenous participants entered the campaign with their own alliances, interests and knowledge of the land.
They shared a battlefield—but they did not all arrive there for the same reason.
September 18 — The 33-Year-Old Governor
Bernardo de Gálvez was only 33 years old during the Baton Rouge campaign.
In New Orleans, his wife, Félicité de Saint-Maxent, and their one-year-old daughter Matilda waited for news.
Their marriage had begun dramatically. Gálvez had married Félicité in 1777 while seriously ill, reportedly fearing he might die before honoring his promise to her.
He recovered. Two years later, the young husband and father was directing a campaign that could determine the future of Louisiana.
Behind the uniform was a family waiting downriver.
September 19 — The Plan Takes Shape
By today in 1779, Gálvez was preparing an elaborate deception.
One group would make itself deliberately visible and noisy, cutting trees and constructing an earthwork where British sentries could observe them. The activity would appear to reveal the location of Gálvez’s artillery.
While the defenders concentrated on that position, the real battery would be constructed on another side of the fort.
Gálvez was preparing to make the British fire at the wrong target.
September 20 — The Night of the Diversion
Tonight in 1779, the woods around Baton Rouge echoed with chopping, construction and British cannon fire.
Gálvez’s diversion was working. The British focused on the noisy earthwork they believed threatened the fort.
Elsewhere, under cover of darkness, Gálvez’s men dug trenches and positioned artillery behind protective earthworks. Moving heavy cannon quietly at night required discipline, muscle and nerve.
By morning, the British would discover that they had spent hours firing at the wrong position.
The battlefield had been rearranged while they watched.
September 21 — The Battle of Baton Rouge
At daybreak on September 21, 1779, Gálvez’s concealed artillery opened fire on Fort New Richmond.
The British attempted to redirect their guns, but Gálvez’s battery was already protected. After several hours of bombardment and mounting damage, the fort raised a white flag.
Gálvez demanded more than Baton Rouge. The surrender terms also included Fort Panmure at Natchez, extending the victory farther up the Mississippi without another major battle.
In one campaign, Manchac, Baton Rouge and Natchez were removed from British control.
Louisiana had helped secure the lower Mississippi—and changed the geography of the American Revolution.