Compared to Gen. William T. Sherman, who is given great but poorly rationalized tribute by today's Unionist descendents, Forrest as a saint. Forrest was a brilliant strategist, consistently snatching victory from the jaws of defeat, escaping traps and seemingly hopeless situations, becoming a thorn in the side of the North. He allowed his men, however, upon capturing a garrison of black Union soldiers and accepting their surrender at the horrific battle of Chickamauga, to slaughter the men. Unconscionable, but at least they actually were enemy soldiers who had fought tenaciously against Forrest's men.
Sherman, on the other hand, has benefited from northern historians' defense of his brutality, inhumanity, and terrorist tactics for over 150 years. Going beyond apologizing for his crimes, they've redressed them as heroism. Though Sherman constantly claimed he never ordered the rape and murder of Southern civilians and the total destruction of their food, livestock, and field crops, he didn't do anything to stop it either. It is unlikely his men took their inspiration from anyone other than Sherman himself.
His 1,000-mile march through the South left tens of thousands of men, women, and children homeless, separated from families, and starving. Many who weren't outright murdered by his army died of hunger and disease later. When his army got to South Carolina, the first state to secede, he did nothing to stop his men from raping, pillaging, burning indiscriminately homes, farms, businesses, government buildings. They even burned a convent to the ground.
He wrote in his diary, found years later, prior to the march into the state, "I must tremble for South Carolina's fate. but I feel like it deserves everything that it's going to get." Sherman feigned regret at the criminal behavior of his army, but years later wrote in his memoirs, "Though I never ordered it, and never wished it, I have never shed many tears over the event, because I believe it hastened what we all fought for: the end of the war."
If you thought generals and politicians should have been tried, convicted, and punished to the maximum extent of the law over My Lai, then you have to believe Sherman should have been tried, convicted, and executed for war crimes. My Lai was war. Sherman was a terrorist.