 Migratory groups of Native Americans inhabited the area for thousands of years , but the first permanent settlements in what would become Harrison County were created by American settlers in the years after the American Revolutionary War . The population grew rapidly during first decade of the 19th century . Corydon was officially platted in 1808 and became the capital of the Indiana Territory in 1813 . Many of the state 's early important historic events occurred in the county , including the writing of Indiana 's first constitution . Corydon was the state capital until 1825 , but in the years afterward remained an important hub for southern Indiana . In 1859 there was a major meteorite strike . In 1863 the Battle of Corydon was fought , the only battle of the American Civil War to occur in Indiana . 
