In 1779, George Rogers Clark and a small band of outnumbered, outgunned men captured Fort Sackville from the British.
The 1980 plate memorialized that brave feat.
Oh, and Fort Sackville? You might have driven past its general location if you're at all familiar with U.S. Highway 41. It's now known as the city of Vincennes, approximately halfway between Evansville and Terre Haute.
This plate was issued in Blackford County.