The great epic poem of the Civil War is John Brown’s Body by Stephen Vincent Benet. Although not completely successful, it has quite a few parts which show a great insight into the war. Here is an excellent summary by him of the Army of the Potomac:
Army of the Potomac, advancing army,
Alloy of a dozen disparate, alien States,
City-boy, farm-hand, bounty-man, first volunteer,
Old regular, drafted recruit, paid substitute,
Men who fought through the war from First Bull Run,
And other men, nowise different in look or purpose,
Whom the first men greeted at first with a ribald cry
“Here they come! Two hundred dollars and a ka-ow!”
Rocks from New England and hickory-chunks from the West,
Bowery boy and clogging Irish adventurer,
Germans who learnt their English under the shells
Or didn’t have time to learn it before they died.
Confused, huge weapon, forged from such different metals,
Misused by unlucky swordsmen till you were blunt
And then reforged with anguish and bloody sweat
To be blunted again by one more unlucky captain
Against the millstone of Lee.
Ridden and ridden against a hurdle of thorns
By uncertain rider after uncertain rider.
The rider fails and you shiver and catch your breath,
They plaster your wounds and patch up your broken knees,
And then, just as you know the grip of your rider’s hands
And begin to feel at home with his horseman’s tricks,
Another rider comes with a different seat,
And lunges you at the bitter hurdle again,
And it beats you again–and it all begins from the first,
The patching of wounds, the freezing in winter camps,
The vain mud-marches, the diarrhea, the wastage,
The grand reviews, the talk in the newspapers,
The sour knowledge that you were wasted again,
Not as Napoleons waste for a victory
But blindly, unluckily–
until at last
After long years, at fish-hook Gettysburg,
The blade and the millstone meet and the blade holds fast.
And, after that, the chunky man from the West,
Stranger to you, not one of the men you loved
As you loved McClellan, a rider with a hard bit,
Takes you and uses you as you could be used,
Wasting you grimly but breaking the hurdle down.
You are never to worship him as you did McClellan,
But at the last you can trust him. He slaughters you
But he sees that you are fed. After sullen Cold Harbor
They call him a butcher and want him out of the saddle,
But you have had other butchers who did not win
And this man wins in the end.
You see him standing,
Reading a map, unperturbed, under heavy fire.
You do not cheer him as the recruits might cheer
But you say “Ulysses doesn’t scare worth a darn.
Ulysses is all right. He can finish the job.”
And at last your long lines go past in the Grand Review
And your legend and his begins and are mixed forever.
I think the best study of the Army of the Potomac, albeit now dated, is Bruce Catton’s Army of the Potomac Trilogy: Mr. Lincoln’s Army, Glory Road and A Stillness at Appomatox. I first read the trilogy as a boy in the Sixties and it was a revelation to me. It made me a life long student of the Civil War, and a confirmed believer that history need not be dull and poorly written.