First Battle of Bull Run or First Manassas, July 21, 1861
For help finding reports from the the First Battle of Bull Run or First Manassas in the Official Records of the War of the Rebellion
See Series I, Volume 2:
the index:
http://www.civilwarchest.com/official_records/S1-V02/1024/First_Battle_o...
http://www.civilwarchest.com/official_records/S1-V02/1025/First_Battle_o...
http://www.civilwarchest.com/official_records/S1-V02/1026/First_Battle_o...
Summary of Principal Events:
http://www.civilwarchest.com/official_records/S1-V02/300/First_Battle_Bu...