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I was talking with a friend about TL 191 recently and we got to talking about the Peninsular campaign, and he was saying that due to McClellan's incompetence that it could have been a decisive Confederate victory. He pointed out the Battle of Glendale specifically.
I admittedly don't have in depth knowledge of the US Civil War so I looked it up. It seems as though given the right POD the Army of the Potomac could have been devastated at the battle here. However, I'm raising this question to board members who have a far more in depth understanding of that campaign than me. I've only got a passing knowledge of the flaws therein but can try to ask some useful questions