The title "Unidentified Soldier in Confederate Uniform With Side Knife in Blouse (U.S. Civil War)" refers to a historical artifact, specifically a photograph or portrait of an anonymous soldier from the Confederate States during the American Civil War. The soldier is depicted wearing a typical Confederate uniform and carrying a side knife, often used for various purposes such as eating, shaving, or digging. This image provides insight into the appearance and equipment of Confederate soldiers during the U.S. Civil War, although it does not reveal the individual's identity.