My copy of Smithsonian Magazine arrived in the mail yesterday, and it focuses on the 150th anniversary of the Civil War. So I decided to see what kinds of online resources they had that might be of use in a classroom.
If you visit their website, they have a timeline which is organized by year, as well as collections from the portrait gallery on various Civil War related topics. Each topic includes a photo as well as relevant information. There is also a link to the National Postal Gallery, which has some information on Civil War letters. The portrait gallery collections I think would be useful to share with students, especially since it includes all of the information you’ll need for each piece.