The OR, Official Records of the War of the Rebellion, are online at ehistory. I find it easier to type in: Official Records War of the Rebellion. This brings up ehistory and there it is.

Or, you can type in: http://www.ehistory.com/uscw/library/or/list 3.cfm

Most sincerely,
Terri Anne Hastings
Average e-mail is o.k.