There are all kinds of histories online and in libraries and archives which tell the stories of regiments. Some states put out books after the War with a write up for each regiment. Some soldiers published memoirs describing their personal experiences which are wonderful reading if your ancestor served in the same company or regiment.
There is a book on the regiment, available on both ebay and amazon, The Battle Rages Higher, by Kirk C. Jenkins. New and used are offered. Looks reasonably priced.