George Rogers Clark stamp
US #651 was issued for the 150th anniversary of this victory.

On February 24, 1779, George Rogers Clark led the siege of Vincennes.  Despite having smaller numbers and marching in the cold for 18 days, Clark managed to force the British defenders to surrender.

After the French and Indian War, the British occupied the majority of the trans-Appalachian frontier.  They soon passed the Proclamation of 1763, making the settlement of land west of the Appalachian Mountains illegal for colonists.  The British responded harshly to settlers who ignored this decree, sending Native American war parties after trespassers.

Patrick Henry stamp
US #1052 – from the Liberty Series

In Kentucky, George Rogers Clark led a militia to defend the people against these attacks.  However, Clark soon decided he would rather cut the attacks off at their British source.  Clark developed a plan of action and brought it to Virginia governor Patrick Henry, who quickly approved it.  By the summer of 1778, Clark and his army of militiamen were on their way down the Ohio River.

The men traveled over 120 miles before they reached and captured the British outposts at Kaskaskia and Cahokia.  During this time, these settlements were populated mostly by the French, who were not very fond of the British after the French and Indian War.  Most were happy to join forces with George Clark to take on their common enemy.  With the help of Father Pierre Gibault and Dr. Jean Baptiste Laffont, Clark soon gained support from the outpost at Vincennes as well.  The only French settlements Clark could not sway were Detroit and a few other northern posts.

By late summer, British Lieutenant Governor Henry Hamilton had heard of Clark’s successes at Kaskaskia, Cahokia, and Vincennes.  His determination to reclaim these outposts caused him to leave Detroit with a mixed army of British soldiers, French volunteer militiamen, and Native American warriors.  Clark’s second-in-command, Captain Leonard Helm, held Vincennes, known as Fort Sackville, at the time of Hamilton’s attack.  Helm’s men were few in number and were quickly forced to turn over Fort Sackville to Hamilton’s army on December 17.  The French settlers, who had previously supported Clark, quickly abandoned him when they saw the strength of Hamilton’s army.

It was often custom in 18th-century warfare for armies to send their soldiers home during the winter.  British Lieutenant Governor Henry Hamilton followed this custom, which sealed the fate of Fort Sackville.

George Rogers Clark Commemorative Cover
Item #93069 – Commemorative Cover Honoring the George Rogers Clark Expedition

The British forces at Fort Sackville captured merchant and American sympathizer Francis Vigo when he didn’t realize the Americans no longer controlled Vincennes.  Luckily, he was soon released and was able to provide valuable intelligence to Clark about the state of Fort Sackville – including their small numbers.

Armed with this new information, Clark decided to make the 18-day journey from Kaskaskia to Vincennes.  He and his 170-man army trudged through the freezing weather of the Illinois countryside before arriving at Fort Sackville on February 23, 1779.  French occupants who had previously helped Clark were happy to join him once again.  They provided his army with food and dry gunpowder upon their arrival.

Clark and his forces soon began their assault on the British troops at Fort Sackville.  The Americans surrounded the fort with many battle flags, giving Hamilton the impression they had far greater numbers than they did.  They employed several more tactics that were designed to confuse, frighten, and disorient the British and force them to surrender.

George Rogers Clark National Park Quarter
Item #CNINGR25D – George Rogers Clark National Park Quarter

On the morning of February 24, Clark sent a message to Hamilton demanding his surrender.  Hamilton refused and Clark continued to fire on the fort for another two hours.  Clark then demanded he surrender within 30 minutes or they would storm the fort.  Hamilton again refused but proposed a three-day truce.  They agreed to meet at a nearby church, where they worked out terms of surrender.  The following morning, Hamilton surrendered the fort and his army laid down their weapons in front of the Americans.

After their victory, Clark’s army raised an American flag above Fort Sackville and fired 13 celebratory cannon shots.  Clark renamed the fort for Virginia governor Patrick Henry, who had been the one to approve his plan of attack.

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  1. Kudos for this very informative info.. Brings some life into an otherwise “dry” subject. Kids (of all ages) can surely benefit from it.

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