That is an interesting battle. It was going well for the north (pitting Bishop Polk versus George Thomas could only sound good to Braxton Bragg) until Rosecrans made a fatal mistake.
Not checking a report of a gap, he ordered another division to cover it. This created a real gap.
I don't know if Longstreet discovered this gap and attacked, or if it was just happenstance he hit the right spot.
Since most accounts say the Yankees had set up breastworks, it would be interesting to see if the Rebs could punch through.
"These things must be done delicately-- or you hurt the spell." - The Wicked Witch of the West.
"We've got the torpedo damage temporarily shored up, the fires out and soon will have the ship back on an even keel. But I would suggest, sir, that if you have to take any more torpedoes, you take 'em on the starboard side." Pops Healy, DCA USS Lexington.