Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 1st Regiment Indiana Heavy Artillery was a heavy artillery regiment that served in the Union Army during the American Civil War. It was nicknamed the "Jackass Regiment." The 1st Indiana Heavy Artillery was organized in Indianapolis, Indiana July 24, 1861 as the 21st Indiana Infantry under the command of Colonel James Winning McMillan. The regiment was converted to heavy artillery in February 1863. The regiment was attached to Dix's Division, Baltimore, Maryland, to February 1862. Butler's New Orleans Expedition to March 1862. 2nd Brigade, Department of the Gulf, to October 1862. Independent Command, Department of the Gulf, to January 1863. Unattached, 1st Division, XIX Corps, Department of the Gulf, to February 1863. Artillery, 1st Division, XIX Corps, to August 1863. District of Baton Rouge, Louisiana, Department of the Gulf, to June 1864. Unattached, XIX Corps, and unattached, Department of the Gulf, to January 1866.