Gen Clement Hoffman Stevens - Confederate States Army brigadier general during the American Civil War. He designed and constructed the iron-clad battery on Morris Island at the mouth of Charleston Harbor which was used in the bombardment of Fort Sumter at the outbreak of the Civil War. He was killed in action at the Battle of Peachtree Creek during the Atlanta Campaign.
It's tempting to think that spy gadgets aren't all that old, but even Caesar encoded messages using cryptography. This disk dates back to the Civil War, when it was used by the Confederate side -- CSA stands for Confederate States of America. It's pretty obvious how the device works: rotate the inner wheel to displace the letters. M = G, P = J, etc. Simple to crack, right? Not if the message is written in a language you don't know. Spies were tricky like that.
Confederate Cap Worn by a North Carolinian Killed in Action. This exceedingly rare chasseur pattern cap belonged to Private J. Austin Craven, a 29-year-old farmer who served in Company G, 46th North Carolina Volunteer Infantry. The Randolph County native enlisted in April, 1862 and was killed during the Battle of Cold Harbor in June, 1864.