Curated OER
National Park Service: Cwsac: Civil War Battle Summaries: The Battle of Fredericksburg, 1862
An excellent review of the events in 1862 in the run-up to the Battle of Fredericksburg and the battle itself. Hyperlinks to Lee's and Burnside's official reports. Includes PDF (requires Adobe Reader).
Other
Pa Roots: Pennsylvania in the Civil War
Background information about Pennsylvania's involvement in the Civil War. This website describes briefly the impact Pennsylvania provided to the union forces during the war.