The difference in the dynamics of Petersburg and Ukraine today is that the from is not getting appreciably longer. Also, I do not think there has been a spike in Russian desertion. (Maybe, but the Ukrainians would know better than I would).You are 100% correct. Many of the troops were getting letters from home about how bad things were and they knew the whole thing was lost and wanted to go home and take care of their families.
The other interesting thing is that Grant was willing to keep the pressure on the Army of Northern Virginia. During the Overlanf Campaign he just kept sliding to his left and trying to get past Lee’s right flank. When he wasn’t successful he was willing to frontally assault prepared positions like those at Cold Harbor. He suffered more casualties during that campaign than Lee had in his army and he just kept coming. Because he could replace the troops The other generals before him would lose or have a stalemate, such as Antietam, and let Lee rest, refit, and work to refill his ranks as much as possible. Grant kept the pressure on and bled Lee dry. It was a good strategic plan, but it was brutal. I’ve always thought Sherman was the better field general. How he handled the Atlanta campaign was a masterclass in winning without frontal assault after frontal assault.
Desertion (then and now) can be three sways: you can desert to the enemy and join his fighting forces, you can desert to the enemy and promise not to fight any more (or get sent to a POW camp), or you can just run to your own rear, throwing away your rifle and uniform and try to make your way as best you can.
Not sure how many of the first option has happened in Ukraine. I am not sure if course two (parole) is an option for Russian soldiers in Ukraine. There might be some of option three, but Putin's police state is likely to catch you eventually and if they do, shoot you.
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