I'm having a hard time finding the answer I'm looking for here. I'm curious both about what tactics were used and how they changed over the course of the war.
I've found a lot about how technology (particularly rifling and railroad networks) made fighting very different from previous wars. But I can't find anything about how these changes affected things like organization, priorities, and movement on the battlefield.
It seems that they entered the war using tactics not far off from what you'd see in the American Revolution. I'm assuming they realized problems with this over the course of the war and made changes accordingly.
I kinda touched on this question here, and more directly here. To summarize, American soldiers basically caught up to contemporary armies in terms of tactics and organization, fighting a war on an order of magnitude totally apart from previous American war. The use of riverine steamships was an innovation, but not one terribly impactful in future wars. The Confederates used railroads in very interesting ways, but as far as I know, the Union tended to use them more like typical roads with better throughput. However, rifled weapons had essentially no impact on ACW tactics.