Civil War Soldiers and Sailors System
The Civil War Soldiers and Sailors System(CWSS) is a database containing very basic facts about servicemen who served on both sides during the Civil War. Their main focus is on the names of all the soldiers, where they served, and what their rank was. They now have 6.3 million soldiers in the database.
I wasn't sure of anyone in my family history who served in the Civil War (1861-1865), so I just typed in a few different last names to see who the database would pull up. I found 1 or 2 soldiers that I believe are my ancestors, based on their peculiar names and being of age to serve. The information you get is very basic, no birth dates to verify the person is your ancestor, but it's good information nonetheless.
The CWSS is still trying to obtain and enter in all the records of the Naval personnel (sailors); these records were not as organized as the Army records, so are taking longer. They are also looking into including information on thousands of Civil War monuments in the future.
They do have information on Union and Confederate regiments as well as information on over 1,200 Civil War soldiers who received medals of honor. There are also prisoner records, histories of the 364 most significant Civil War battles, and a few cemetery records as well.
The CWSS appears to be adding information regularly and seems to be a good place to search for some ancestors.