What is his source for this assertion:
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It seems rather odd that Rosecrans would pull out the maps at this stage for no particular reason and have second thoughts about distances. It was, after all, his plan.
Occam's razor would lead us to believe that Dickey and Lagow handed him the dispatch and the realization that he would be leading the attack led him to pull out the maps to reconsider splitting his forces.
At the end of a long paragraph that includes your quote and the conversation between Rosecrans, Dickie and Lagow, there's this:
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Col. Mizner was Rosecrans cavalry commander. He'd gotten off early to screen for the army.
A map probably helps at this point.
The next time Col. Mizner appears in the narrative is at Barnett's Crossroads, where Rosecrans had planned to divide his army. By then, squirmishes had erupted on Hamilton's front as his cavalry pushed towards Cartersville (per original plans).
Hamilton and Sanborn assumed this order to pause at Cartersville was simply a matter of aligning all ducks in a row and proceeding in a coordinated fashion. However an order to "hold that crossing at all hazards" raises questions about whether there was some kind of panic. It wasn't a crossing that was necessary for a retreat, or even the only approach to the enemy, but it was essential for the pincers move. One has to assume Rosecrans still intended the pincers move at that point but was panicking about its prospects for success because he was discovered this early.
Rosecrans then settled down to see what to do. How or why Col. Mizner waited for this moment to rectify map errors we don't know. Assuming nothing ominous it could have been simply that Rosecrans didn't know his map was off until consulting with his cavalry chief about the problems Hamilton and Sanborn encountered and possibly as he calculated how long it would take to get them in place, etc.
Dickie and Lagow showing up at that moment, is already twice the coincidence. I don't even understand the argument with Dickie and Lagow if Rosecrans had already decided to move in a single column. Rather, I think Rosecrans would have had much more of an objection to Dickie and Lagow's change of plans per Grant, if he was still intent on moving his second column to the Fulton Road. If that were the case, I could understand his pleas with Dickey and Lagow that he needed additional time to get that second column in place and that he
needed Ord to take the risk of engaging the entirety of Price's force unaided, for him to be able to safely move to the Fulton Road. Otherwise his quibbling with Dickie and Lagow sounds hollow, like we are missing something. I mean look at this reconstruction of the argument per Rosy:
Notice how even this controversial account has Rosecrans still mentioning the desire to get the "roads" in Price's rear. (Him stating that he still hoped for a surprise there is one of many questions I have about the veracity of the statement.)
He wasn't going to admit that inadequate reconnaissance and wrong maps were the reasons for his failure to block both roads, because that's a miscalculation and error attributable to himself and his staff.
The inaccuracy of maps and lack of prior reconnaissance was a problem.
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One has to wonder whether Rosy would still have presented his original plan if he'd known the actual distances, and his maps were the correct scale.
Or are you suggesting this issue with the inaccuracies of maps is made up after the fact?
If it were, I'd say that the fact Hamilton and Sanborn were discovered as they were moving on Cartersville was already problematic for Rosecrans as he showed in that panicked order to hold that crossroads at all hazards. A crossroads which he abandoned not too long after. The whole surprise he thought to deliver was over and done with by then. He had been seen approaching at Cartersville and maybe just that exposed that column to attack and defeat in detail. He could have even known the distance and the difficulties of the Fulton road previously, but he couldn't deliver the element of surprise due to his tardiness. He also wasn't going to admit to that mistake and error.
If anything I am not damning Rosecrans, but he had proposed an ambitious plan that was too difficult to execute and coordinate in civil war conditions,
even for his side of the equation. Just considering his own difficulties, he was already off piste.