Placing a certain cannon at a certain battle

The topic is pretty well covered and pictured here:https://www.go2gbo.com/threads/1861...ch-registry-number-10.424808/#post-2056111982

In summary, we have strong evidence that 2.9 inch Parrott rifle No. 10 was present at the First Battle of Bull Run in 1861, and we’re seeking corroborating info.

https://www.go2gbo.com/threads/1861...ch-registry-number-10.424808/#post-2056111982