[DoodleDawg]

Yes, indeed it did. He had a heart attack at Gettysburg.

That's speculation, and even if true what does that have with his tactical thinking?

[miss marmelstein]

It is not speculation - it was and is obviously true if one reads history without an agenda or an ax to grind.

I will leave it to others to explain how a serious illness affects judgment although one would think it is self-explanatory.