The Civil War Trust, part of the National Park Service, has recorded a series of four minute videos about battles, battle fields, battle field preservation, and more. http://www.civilwar.org/education/in4/
The centenary of the Civil War triggered or encouraged a exploration and preservation of battle fields. Civil War Scholarship increased along with the study of primary sources and landscapes.
The Sesquicentennial of the Civil War, which is just ending this year, was another turning point in the study of the war and the preservation of materials.
Both the Civil War Trust and the National Park Service have lots of materials about the Civil War, Battles and Skirmishes http://www.nps.gov/civilwar/search-battles.htm, and Military Units and Soldiers http://www.nps.gov/civilwar/search-soldiers.htm, and even Places http://www.nps.gov/civilwar/places.htm that were affected by the war. Take some time to explore these valuable online resources.