re: 155 years ago today: Ulysses S. Grant secured Chattanooga

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They learned the value of combined arms, railroads and waterways in troop movements, and how indispensable industry would be.

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Definitely agree there.

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They DID NOT learn from Pickett’s Charge, Grant’s frontal assault on Cold Harbor, Antietam, or how the war had evolved by Petersburg.

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Generally agree, but they should've paid more attention to the bolded and that they didn't was largely attributable to their own hubris. I know that they'd seen some brief and small-scale trench warfare at Sevastopol and the like, but it wasn't the grinding, theater-wide hell that Vicksburg and then Petersburg became. They dismissed the trench experience of the ACW and the Russo-Japanese War to their own very sad detriment.