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1. The "Richmond Howitzers" were partially manned by black militiamen. They saw action at 1st Manassas (or 1st Battle of Bull Run) where they operated battery no. 2. In addition two black "regiments", one free and one slave, participated in the battle on behalf of the South. "Many colored people were killed in the action", recorded John Parker, a former slave.

Here is a Link listing the Confederate Order of Battle for First Bull Run. In addition to explaining why the Richmond Howitzers are not included, can you please identify which regiments were the Black ones?

This isn't my research.
I linked to a page, so go read it there, where they show the sources.
Like I told Whiskey-guy, I'm not gunning for anyone.
longtermmemory posed a question about slaves serving in exchange for freedom. The googling I did turned up the first document I posted. There were some interesting lines in it about black recruiting, so I posted the other stuff, and in my other post, listed the bio of who is apparently the main source. If it's all a fabrication, I find it odd there are so many books and other media on the topic, but anything is possible. Some other time if I have the inclination I'll do some more searching.
I will say if you google for "Richmond Howitzers" you'll find plenty of references to 1st Manassas.