I will give you McClellan is a strange case - appearing paralysed by a curious over-estimation of Confederate strength. I probably over-stated my case. Poor generalship does seem to have been a factor in the first half of the war in the East. But what I was getting at was that there were competent Union generals in the west and for the second half of the war in the East, but still winning the war was a slow process. It's hard not to see it in terms of attrition - of the superior resources of the North slowly wearing down the South.
I mentioned the scale issue as my the first reason (aside from any Union incompetence) for the ACW being long, but still would make a case for technology being a second. The crucial Eastern front, where a quick Union victory was more of a possiblility, was a relatively small war zone. The distance from Washington DC to Richmond is only 88 miles. One factor that stopped even competent generals like Grant from quickly defeating the Confederacy was the difficulty in decisively winning an offensive battle in the face of entrenchments and firepower of near-WW1 lethality. You only need to look at the final fighting around Richmond to see evidence of that. ("Grant maneouvred his entrenchments around Richmond" is one memorable description from the later stages of the war.)
I confess I don't follow the logic here.If technology meant wars could no longer be won by single battles then why where there so many long wars that involved several battles?
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