If you like sketches like these …
… then you might like to look at this:
CHARLES WELLINGTON REED PAPERS
The papers of Civil War soldier and artist Charles Wellington Reed, who served with the Ninth Independent Battery, Massachusetts Light Artillery, includes approximately seven hundred sketches and correspondence relating primarily to the Civil War. The letters are often prefaced by drawings which further illustrate not only the rigors of military life, but also the amusing and mundane aspects. The contents of the letters and corresponding sketches well document the ways in which soldiers adapted to seasonal changes in the weather, how they amused themselves, and the routines of camp life in the Army of the Potomac.
Online presentation: http://www.loc.gov/collection/charles-reed/about-this-collection/
Finding aid in html: http://hdl.loc.gov/loc.mss/eadmss.ms001005
Finding aid in pdf: http://rs5.loc.gov/service/mss/eadxmlmss/eadpdfmss/2001/ms001005.pdf
Reed won the Medal of Honor for his actions at Gettysburg in rescuing battery commander Captain John Bigelow on July 2, 1863, when the 9th Massachusetts Battery came under attack that afternoon.