Early tanks from OTL for examples were entirely at the mercy of contemporary field guns but by requiring field guns to be brought in to engage them directly they still performed a lot of their mission even when they did not in fact kill, maim or drive off the crew of said weapon and carry on regardless.
The M1857 12 pdr Napoleon weighed around 2500 pounds, with a six horse team and caisson.
With rifled muskets, gunners who rode towards the sound of the guns to employ the cannon, had a short life on ACW era battlefields. The gunshield for the crew was a bit in the future, though it shouldn't have been, esp. for the new breechloaders
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