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|I was thinking more of fully mechanical steam devices that came out of the Industrial Revolution as my definition of a machine (engines, tools, capital equipment, steamboats and locomotives). I wasn't really thinking of mills as a machine, despite their being somewhat mechanical too. I guess allowing mills as a machine, I am probably wrong that "most" machines were coal powered.
I don't think the coal mines were the initially planned target. Lee was looking for a victory on Northern soil, plain and simple. But if Meade sat on the defensive in a strong position, Lee would be forced to look for other alternatives. Stripping the Pennsylvania of resources and destroying key infrastructure would have been an attractive alternative to beating the AoP.