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The Illinois Country along with most of its North American possessions was surrendered to Great Britain when it signed the
Treaty of Paris that ended the Seven Years War in 1763. British troops of the 42nd Royal Highland Regiment took possession
of Fort de Chartres on October 10, 1765.
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Doing very little with the newly renamed Fort Cavendish to keep it from flooding, eventually the British decided that the
fort had little value and abandoned it in 1771. A year later the south wall and bastions collapsed into the Mississippi River.
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Continued flooding, erosion, and decay caused the fort to slowly dissapear. By 1900 the only remain of the fort that existed
above ground was the powder magazine (photo above.) It considered by to be the oldest building in Illinois.
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