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Virginia frontiersman and military commander who conceived and executed the capture of the Illinois Country in 1778. Leading only 175 men, Clark took Kaskaskia on July 4–5, 1778, then won back Vincennes from Henry Hamilton in February 1779 after a brutal winter march. His campaigns secured American claim to the Northwest Territory.

French-born British officer commanding the Kaskaskia garrison when Clark struck on July 4–5, 1778. Rocheblave was captured in his bed, having received no warning of Clark's approach. His letters to British authorities in the months before the raid had warned that the Illinois Country was poorly defended and that American settlers across the Ohio were a growing threat — warnings that went unheeded.

Catholic priest serving all the French Creole communities of the Illinois Country from his base at Kaskaskia. After Clark's capture of the town in 1778, Gibault became a crucial intermediary, persuading his parishioners to support the American cause and traveling to Vincennes to bring that settlement over to Virginia's side without military force. His role demonstrated the importance of cultural and religious ties in frontier diplomacy.

Virginia militia officer whom Clark left in command of Vincennes (Fort Sackville) after the town peacefully transferred its allegiance to Virginia in 1778. Helm commanded a tiny garrison and was forced to surrender when Hamilton retook Vincennes in December 1778 — reportedly the only member of the garrison who refused to accept British protection terms. He was among those Clark liberated when he retook Vincennes in February 1779.

Italian-born fur trader based in St. Louis who became one of George Rogers Clark's most important intelligence sources and financial backers. After Hamilton recaptured Vincennes in December 1778, Vigo traveled to Kaskaskia to inform Clark of the British strength and disposition, enabling the winter march that retook the fort. He spent much of his own fortune supporting the American cause and spent decades trying to recover what he was owed.

British Lieutenant Governor at Detroit who administered the entire Illinois Country and western frontier. Known to American Patriots as the "Hair Buyer" for alleged payments to Native allies for scalps — a charge he denied. Hamilton recaptured Vincennes from the Americans in December 1778 but was himself captured by Clark in February 1779 and held as a war criminal rather than a prisoner of war.

Virginia militia captain who served under George Rogers Clark throughout the Illinois campaign of 1778. Montgomery participated in the capture of Kaskaskia and helped garrison the Illinois posts while Clark planned the Vincennes operation. He later served as a courier between the Illinois Country and Virginia, helping maintain communication across the enormous distances of the frontier.

Prominent French Creole fur merchant at Kaskaskia who initially fled when Clark's force arrived but returned after Clark's diplomatic overtures convinced the French community that Americans would respect their religion, language, and property. Cerré became an important local supporter of the American cause and a key figure in the community's transition from British to American governance.

Kentucky frontier scout and militia ranger who served as one of Clark's most important intelligence gatherers during the Illinois campaign. Kenton's ability to move through the western wilderness and gather intelligence about British and Native movements made him indispensable to Clark's planning. He survived capture by Shawnee warriors in 1778 through extraordinary luck and endurance.