One of the references for the latest Atun-Shei Films “Checkmate Lincolnites!” video was an older article in the Smithsonian Magazine outlining the career of one of the best — yet least known — Union generals in the American Civil War:

George Henry Thomas (July 31, 1816 – March 28, 1870), the “Rock of Chickamauga”, was a career U.S. Army officer and a Union general during the American Civil War, one of the principal commanders in the Western Theatre.
Image from the Library of Congress Prints and Photographs Division via Wikimedia Commons.

… for Thomas, every battlefield success seemed to stir controversy or the jealousy of ambitious rivals. Unlike other noted generals, he had no home-state politicians to lobby on his behalf in Washington. Ulysses S. Grant, for example, was championed by Illinois congressman Elihu Washburne, and Sherman by his brother, Ohio senator John Sherman. For Thomas, every step upward depended solely on his performance in the field.

In one of the war’s first skirmishes, he led a brigade in the Shenandoah Valley that bested Confederates under Stonewall Jackson. When the dashing Rebel J.E.B. Stuart heard that Thomas was commanding Union cavalry, he wrote to his wife that “I would like to hang him as a traitor to his native state.” Even after that, there was lingering doubt among some Unionists, including Lincoln. Unlike Grant, Sherman, George McClellan and some other ranking Union officers who had broken their military service with years as civilians, Thomas had been a soldier since the day he entered West Point. Yet when his name came up for promotion, the president, restrained by Northern radicals and surrounded in the Federal bureaucracy by Southerners, said, “let the Virginian wait.” But Sherman among others vouched for Thomas, and soon the Virginian was elevated to brigadier general and ordered to organize troops away from Virginia, beyond the Appalachians.

[…]

As Thomas rose, he proved to his men that his addiction to detail and his insistence on preparation saved lives and won battles. His generalship behind the front, before the battle, was generations ahead of his peers. He organized a professional headquarters that made other generals’ staff work seem haphazard. His mess and hospital services, his maps and his scouting network were all models of efficiency; he was never surprised as Grant had been at Shiloh. He anticipated modern warfare with his emphasis on logistics, rapidly repairing his railroad supply lines and teaching his soldiers that a battle could turn on the broken linchpin of a cannon. He demanded by-the-book discipline, but taught it by example. He made no ringing pronouncements to the press. His troops came to understand his fatherly concern for their welfare, and when they met the enemy they had faith in his orders.

In late summer, Rosecrans moved against the Rebel stronghold of Chattanooga, a crucial gateway between the eastern and western theaters of war. Confederate general Bragg pulled out of the town onto the dominating nearby mountains, waiting for Maj. Gen. James Longstreet to bring reinforcements from Virginia. When they came, Bragg threw everything into an assault on Union lines along Chickamauga Creek, just inside Georgia. Thomas’ corps was dug in on the Union left. On the second day of furious fighting, a misunderstood order opened a wide gap on his right. Longstreet’s Rebels crashed through; with the always aggressive John Bell Hood’s division leading, they bent the Union line into a horseshoe.

Rosecrans, certain the battle was lost, retreated into Chattanooga with five other generals and thousands of blue-uniformed soldiers. But Thomas inspired his men to stand fast, and only their determined resistance saved his army from destruction. They held all that afternoon against repeated Confederate assaults, withdrawing into Chattanooga after nightfall. It was the greatest of all battles in the West, and since that day, Thomas has been known to history as the Rock of Chickamauga.

[…]

On December 15, Thomas, unaware that Grant intended to fire him, roared out of his works against Hood. In two days his troops crushed the Rebel army. His infantry, including two brigades of U.S. Colored Troops, smashed into Hood’s troops while the Union cavalry, dismounted with its fast-firing Spencers, curled around and behind the Rebel left. Almost a century later, historian Bruce Catton summed up the battle in two words: “Everything worked.”

Thomas “comes down in history…as the great defensive fighter, the man who could never be driven away but who was not much on the offensive. That may be a correct appraisal,” wrote Catton, an admirer and biographer of Grant. “Yet it may also be worth making note that just twice in all the war was a major Confederate army driven away from a prepared position in complete rout — at Chattanooga and at Nashville. Each time the blow that finally routed it was launched by Thomas.”

Nashville was the only engagement in which one army virtually annihilated another. Thomas B. Buell, a student of Civil War generalship, wrote that in Tennessee, Thomas performed the war’s “unsurpassed masterpiece of theater command and control….So modern in concept, so sweeping in scope, it would become a model for strategic maneuver in 20th-century warfare.” After it, there was no more large-scale fighting west of the Blue Ridge.