I don't think it was a slow change at that point. Lee return to VA as usual, and the Federals followed as usual. The change happened when a new General of the Army was appointed. Grant did what was necessary to show that the Northern armies were going to operate differently. Like Keith, I am a Yankee.
Gettysburg could have been a Confederate victory by doing what they normally did - fought a defensive action on day two or three.
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Semper Fi
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