How brutal executions outside Fort Sackville broke British morale and secured the Northwest Territory for America in 1779

George Rogers Clark’s Daring Conquest of Fort Sackville

The George Rogers Clark National Historical Park in Vincennes, Indiana marks where one impossible winter march changed American history forever.

In 1778, British Lieutenant Governor Henry Hamilton, called the “Hair Buyer” for paying bounties on American scalps, controlled Fort Sackville and terrorized Kentucky settlers.

When Italian merchant Francis Vigo escaped British capture with crucial intelligence, George Rogers Clark saw his chance.

Clark led 170 men on a brutal 240-mile march through flooded Illinois territory, wading chest-deep through icy water for days.

He blackened his face with gunpowder and entered the freezing floods first.

After intimidating Hamilton with brutal executions, Clark captured the fort and secured the entire Northwest Territory for America.

The memorial’s stunning murals bring this incredible story to life.

The Hair Buyer Terrorized Kentucky Settlements

Henry Hamilton got his nickname “Hair Buyer” after paying Native Americans for American scalps during 1777’s “year of bloody sevens.”

He left Detroit with 175 troops and over 200 Native American fighters in October 1778.

They took back Fort Sackville at Vincennes on December 17, 1778, and caught Captain Leonard Helm who ran the fort.

Hamilton felt so safe he sent most of his men home for winter, keeping just 80 guards during the cold months.

Italian Merchant Tricked the British Commander

Francis Vigo, an Italian merchant from St. Louis with Spanish papers, went to Vincennes in December 1778 on a secret job for Clark.

Native Americans caught Vigo and took him to Hamilton at Fort Sackville.

Hamilton didn’t trust Vigo but couldn’t lock up a Spanish citizen without causing trouble with Spain, who stayed out of the war.

Hamilton let Vigo walk around town daily but made him check in, giving Vigo the perfect chance to count soldiers and spot weak points.

French Villagers Helped Free the Spy

The French folks living in Vincennes, led by Father Gibault, said they’d stop sending food to the fort unless Hamilton freed Vigo.

Hamilton gave up and let Vigo go if he went straight back to St.Louis without helping the Americans.

Vigo followed the deal exactly by first going to St. Louis, then quickly heading to Kaskaskia. On January 29, 1779, Vigo showed up at Clark’s base with details about Hamilton’s men and plans.

Clark Faced a Do-or-Die Decision

Vigo told Clark that Hamilton planned a spring attack on Kaskaskia with fresh troops coming from Detroit.

Clark had to make a tough choice: give up all the land they’d won or attack Hamilton’s smaller winter crew right away.

Clark wrote to Governor Patrick Henry: “I know the case is desperate; but, sir, we must either quit the country or attack Mr. Hamilton.”

With no backup coming, Clark chose to make a risky 240-mile winter march to Vincennes.

Soldiers Headed Into Freezing February Waters

Clark left Kaskaskia on February 6, 1779, with 170 men, including Virginia fighters and French volunteers who joined him.

Captain Joseph Bowman served as his second-in-command and kept a daily journal about everything that happened.

Clark sent a boat called the Willing down the Mississippi and up the Ohio River to bring supplies near Vincennes.

The men carried food on pack horses while hunters shot game along the way to feed everyone on the tough journey.

Chest-Deep Water Blocked Their Path

The army reached the Little Wabash River on February 13 and found it flooded five miles wide with freezing water.

They built a big canoe to move men and supplies across the rushing water in bitter cold. Food ran low as pack horses died and men could only carry what fit on their backs.

The French volunteers from Kaskaskia started talking about turning back as everyone got colder, hungrier, and more miserable each day.

Clark Jumped First Into Icy Floodwaters

Just nine miles from Vincennes at the flooded Embarras River, Clark faced men ready to quit after days without proper food.

Clark blackened his face with gunpowder and jumped first into chest-deep icy water to lead his men forward.

The troops walked through freezing water for days, sometimes up to their necks, while Clark kept a good mood despite the pain.

Captain Bowman wrote that the men hadn’t eaten for four days but felt eager to get revenge on Hamilton.

Hungry Soldiers Surrounded the Fort

Clark’s tired and starving army reached Vincennes on February 23, 1779, without British guards spotting them.

The French villagers welcomed the Americans warmly and secretly gave them hidden bullets and supplies for the attack.

A small group of 14 men started shooting at the fort while the main force used houses in the village as cover.

Hamilton thought the gunfire was just locals having fun until a British soldier got hit by a bullet through a window.

Tomahawk Executions Sent a Message

Clark made his small force of 170 men look like 500 by showing many flags and firing guns quickly from different spots around the fort.

His men caught a Native American war party trying to return to the fort during the night.

Clark ordered five captured Native Americans killed by tomahawk right where Fort Sackville’s guards could see everything.

Hamilton sent Captain Helm to talk terms, but Clark wanted them to give up completely within 30 minutes.

The Hair Buyer Surrendered Without a Fight

Hamilton asked for a three-day break and wanted to meet inside the fort walls, but Clark turned down all offers except total surrender.

Clark agreed to meet Hamilton at the village church after showing how set he was on winning.

The British fort had only 40 regular soldiers and 40 French volunteers who refused to fight against their own people.

Hamilton saw he had no hope with wounded men and no help coming from Detroit, 600 miles away.

America Doubled Its Size Through a Winter March

Hamilton gave up Fort Sackville on February 25, 1779, at 10:00 AM without raising the British flag to avoid public shame.

Clark captured Hamilton and 25 others, sending the “Hair Buyer” in chains to Williamsburg as a prisoner. Virginia quickly created Illinois County to make American control over the conquered land official.

This victory helped the United States claim the Northwest Territory in the 1783 Treaty of Paris, almost doubling the size of the original thirteen colonies and opening up what would become Ohio, Indiana, Illinois, Michigan, and Wisconsin.

Visiting George Rogers Clark National Historical Park

George Rogers Clark National Historical Park at 401 S. 2nd Street in Vincennes tells the story of Clark’s daring winter march and capture of Fort Sackville.

You can visit free daily with the visitor center open 9am to 5pm. Watch the 30-minute film “Long Knives” on demand to learn about the Hair Buyer Terror and spy tactics.

You need a park ranger escort to access the memorial, and there’s a Francis Vigo statue near the Wabash River.

This article was created with AI assistance and human editing.

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