We feel the Barwin non-pick with the same amount of rage and sorrow as the Romans did the moss of those legions, it's practically the same thing
The similarity between Cannae and Mongol tactics is the flexibility and yeilding involved which allowed the encirclement, Hannibal led with his center and allowed it to get pushed back, he allowed the Romans to encircle themselves with his line, the Mongols practiced tactical yeilding all the time, you could even argue that the 'beend but dont break' defense is an application of that idea, assuming you actually stop the enemy.
My analysis of Stalingrad isn't irrelevant, there are several key points in that which could easily be applied:
1) attack when the enemy is weak -> they should have resigned Welker last offseason when the price would have been low, they're going to have to pay alot more now. I wouldnt have waited so long to sign Mankins, waiting is what led to the Jahri Evans getting his monster deal with caused the debacle with Mankins. This can also be applied to running an offense, it's called "taking what the defense gives you". Common themes.
2) Hitler erred by not making up his mind, a mistake he would repeat throughout the war, if he wanted to take Stalingrad he could have easily done so earlier, if he wanted to ignore it and make a drive to the Caucus region he should have done that. In the words of the immortal Mr. Miyagi "Karate do, guess so, squish, just like grape".
3) By just looking at what happened on a Sunday you're ignoring a ton of things which go into success and failure, things which begin at the top. We've had a history of melting down on defense at critical for years, why is that? If it's coaching then what is being done that's different from what's previously done? Is it scheme, if so how is the current scheme different? What about personnel, what changes have been made in the way personnel are evaluated and selected? Dunlap, Wallace, Veldheer, Mangold, Barwin, the list goes on and on.