High Angle Hell

variations on the theme

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https://c8.alamy.com/comp/2CGJ87F/t...he-savannah-river-and-covering-th-2CGJ87F.jpg

https://media.gettyimages.com/photo...-and-traverse-at-picture-id99167248?s=612x612
 
Shelby Foote mentions that at the Battle of McDowell, General Milroy dug a trench of sorts to dip his cannon into, so they could fire at a higher trajectory.

Not sure if this meets your definition of "trench," since it was a field engagement, and not "trench warfare."
 
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