High Quality Content by WIKIPEDIA articles! The Battle of Corydon was a minor engagement that took place July 9, 1863, just south of Corydon, which had been the original capital of Indiana until 1825, and was the county seat of Harrison County. The attack occurred during Morgan`s Raid in the American Civil War as a force of 2,500 cavalry invaded the North in support of the Tullahoma Campaign. It was the only pitched battle of the Civil War that occurred in Indiana, and no battle has occurred within Indiana since.