As I said, I have posted all the First Bull Run after action reports (Official Reports) included in the War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies (ORs for short). That does not mean, however, that after action reports for all regiments, brigades, divisions and staff can now be found on this site. There are a number of reports missing from the ORs, either because none were ever written or because they were lost or otherwise not available at the time the ORs were compiled. Some were subsequently included in Broadfoot Publishing’s Supplement to the Official Records. I don’t happen to own that particular expensive set of books, and it is not available in digital format. I’d be happy to buy the volume which includes Bull Run reports (Vol. 2 of Vol. 1), if anybody is looking to sell. I previously posted this report from the Supplement.
I suppose there are lots of reasons that so many reports are missing. Many of the federal regiments were no longer in existence within weeks of the battle. And it appears that some brigades either did not require regimental reports, or simply did not forward them along with the brigade report. None of Ewell’s, Early’s, or Holmes’s regiments in Beuaregard’s army are in the ORs, and the only reports of any type for Johnston’s army are his own and those of Jackson, Stuart, and staffers Pendleton and Rhett. On the Union side, there are no regimental reports for the brigades of Richardson or Blenker, and only one or two for most other brigades.
Maybe some of these will turn up in the Supplement. Other places for me to look are the state Adjutant General reports for 1861, though I believe those were culled when the Supplement was compiled. I think the most important source is going to be newspapers. If you should run across anything that looks like an official regimental report published in a newspaper, please let me know about it. As I post these I will cross reference them to the OOBs, just as I have done with the ORs.