evangilder
"Shooter"
I found this one while stumbling. Looks like a great reference/photo site on the Civil War.
CivilWarPhotos.net
CivilWarPhotos.net
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At Cold Harbor the Union troops were attacking so it probably was CSA guns firing and I believe it would be canister firing on infantry in attack. Canister would be a container of musket balls kind of like a monster shotgun shell. Grape shot would be much larger. At Cold Harbor the CSA troops were in trenches and fortifications. The Union took about 7000 casualties in a half hour or so. I believe that Cold Harbor was the one attack that Grant wished he had not ordered.
Cold Harbor has two books devoted entirely to the battle, one by Ernust Fergurson and the other by Gordon Rhea. Both were available in paperback. Rhea is highly recommended.