This book contains never before published information, including artillery firing tables, for an Indiana infantry regiment converted to heavy artillery. It concentrates upon these Hoosiers' three-and-a-half years of duty in the Trans-Mississippi Theater and Gulf states during the Civil War, often as a separate command. They acted as infantry, cavalry and light artillery (with captured cannons) before being converted to heavy artillery in 1863. Their cannons and artillery equipment were hauled by hundreds of mules. The regiment participated in the taking of New Orleans, securing an important rail link to Morgan City, Louisiana, the Teche Campaign, the siege and reduction of Port Hudson, the Red River Campaign, and sieges and reductions of Fort Gaines, Fort Morgan, Spanish Fort and Fort Blakely, Alabama.