It wasn't just memoirs. Gen. Lee's staff officer Charles Marshall, who compiled the official reports, noted it was very difficult to keep the wartime official reports submitted to HQ from wandering into who
did'nt do X or Y, rather than just sticking to what
they did, and and why. He had to interview many officers to determine where their report might have gone off the rails, and determine for General Lee's own reports what was what.
General Sherman, in his own official reports during the war, relative to what happened at Resaca on May 9, offered no specific criticism of Gen. McPherson, because Gen. M. did not disobey any orders, and no disaster resulted. From his report;
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So Sherman's "disappointment" is part of the official record. Ten years later, in his memoir, Gen. Sherman states that his "somewhat disappointment" manifested due to a personal conclusion that McPherson's failure to throw the dice in an all out assault on Resaca, or failing that, digging in on the railroad to await a counterattack on May 9, was seemingly timid, considering SHERMAN, did not believe the Confederates would have fought for that point in any force. In other words, he believed Gen. McPherson might have made some "
bolder" attack" either at Resaca or on the railroad at any point than he did, before his command fell back to Snake Creek Gap, as ordered. Sherman's memoir, vol. 2:
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Sherman is not speaking of McPherson personally, but his generalship. He says HE was certain McPherson's movement was a surprise to the Confederates, and threw them into some disorder:
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Was McPherson's advance, under Dodge, practically unopposed on May 9? Turning to Confederate sources, it appears there were ca. 4,000 CSA troops in the fortifications there by the time of McPherson's withdrawal of that part of his army facing them:
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And more Confederates were on the way according to General Johnston, the Confederate Commander. He states that McPherson's advance engaged the CS cavalry pickets at Snake Creek, all the way to Resaca where they took position in the trenches with artillery, and Hood's corps WAS prepared to move from about Dalton to Resaca for its defense should McPherson have chosen to contended for it... and that was besides the infantry of Polk's corps from Mississippi moving by rail to Resaca en route to join Johnston at Dalton.
But this Night of the 9th, per Johnston:
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So though only perhaps 4,000 troops were in the lines at Resaca when McPherson probed them, Hood's corps was backing them up; And Polk's infantry on the way there, as even Hood admitted in his memoir. It is evidently the case that when McPherson withdrew from Resaca without attacking in force on the evening of the 9th, Gen. Johnston recalled Hood's corps to Dalton:
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Night of the 10th and during the 11th, General Johnston again prepared to reinforce the lines at Resaca as the federals again moved from Snake Creek Gap toward that point, but by then Gen. Polk was at Resaca with Loring's infantry division entire, besides the cavalry still skirmishing with McPherson about Snake Creek Gap...
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General Schofield, who commanded the Army of the Ohio at the time, explains the McPherson's situation on May 9, and why he did no wrong in declining a general assault upon Resaca or digging in against Johnston's army in that vicinity on that day, because he could not conclude, as Sherman had in May, '64, that the Confederates would not have fought McPherson for Resaca on the 9th:
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So Schofield believes McPherson's assault upon Resaca's defenses on the 9th would have required at least 12,000 troops, if not more to then hold it against counter-attack. He was personally convinced that far from having a chance at crippling Johnston's army by cutting off Resaca, had McPherson's army of the Tennessee engaged in a general battle to
take and hold that point, Johnston was not only ready for it, but determined to prevent it and punish them for the attempt, and so, like Sherman, Johnston would have preferred a bolder attempt by McPherson:
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So the argument seems to come down to General Sherman versus General Johnston's personal speculations. Sherman says, if McPherson had been bolder, less timid (as he put it) on May 9, one of the most significant victories of the war MIGHT have been carried out, and Johnston thrown into irrevocable disorder by McPherson fighting a general battle for Resaca or a point on the road. General Johnston, for his part, says that had McPherson chosen to fight to the death for Resaca or a point on the road on May 9, he would have obliged and MIGHT have crushed him before Sherman's other forces could render aid.
But
neither of these circumstances occurred, to the various disappointments of Sherman and Johnston, because of McPherson. To Sherman because of a somewhat "timidity" in his movements and to Johnston because of McPherson's circumspection would not allow for his being baited into disaster.
McPherson simply fell back from what he thought was a bad position, per his orders, back to Snake Creek Gap, per his orders, and advanced with the balance of the army to take on Resaca a few days later, after Johnston had already fallen back from Dalton to that point,
without a general battle. So while McPherson might not have "snapped the whip" as hard as Sherman preferred on May 9, he did it loud enough to cause Johnston to hear it, and eventually to fall back on that point, but without a chance to crush McPherson in doing so.
So we turn to General McPherson himself. His official communications to General Sherman comprise our lone evidences of his doings and reasonings, as he died shortly after, and so could not respond to the personal speculations of Sherman or Johnston relative to their various hopes on the 9th of May as later written about. Here's what McPherson reported to Sherman on the night of the 9th:
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So it was General Dodge of the 16th Corps, the front end of a tenuous and constricted route of march, who probed and skirmished with the Confederate defenses at Resaca on the 9th. He reported that Gen. McPherson personally came up to observe the Confederate fortifications after his troops assaulted and captured the bald hill west of the Confederate lines. As they deployed to face the Confederate fortifications, the skirmishing was continuous at all points, and they were subjected to artillery fire from the fortifications sweeping all open ground, and in some places, bold movements by the Confederates to threaten the flanks of Dodge's 2nd Division, attempting to deploy in the woods, etc. When McPherson decided against a general assault, and then the withdrawal, it was done with difficulty, and without massing, by regiments, and under fire, as the Confederate artillery swept the open ground through which they had advanced, and next withdrew back to Snake Creed Gap, as Sherman's standing orders provided for.
McPherson on the 10th reported to Sherman that all his units had been in, and remained, in constant contact with Confederate skirmishers, a continuous skirmish line, in fact, several miles long, while advancing and withdrawing about Resaca on the 9th, and this certainly signifies that Johnston knew exactly what force was approaching Resaca, which contingency Johnston says he planned for the previous day, the 8th, when McPherson first moved into Snake Creek Gap. McPherson to Sherman on the afternoon of the 10th:
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So there we have it. Besides Shermans' personal opinion that He missed a chance at great victory by McPherson's not attacking Resaca or contending for the railroad on the 9th; and Besides Johnson's that HE missed a chance at a great victory by McPherson's not attacking and contending for Resaca or the railroad on the 9th; Gen. McPherson was satisfied that had Gen. Sherman personally witnessed the positions and situation, he would have approved his course of at least threatening Resaca and the railroad on the 9th, and digging in at Snake Creek inviting a counterattack by Johnston, who declined to attack Snake Creek Gap, but did in fact choose to withdraw his whole force from about Dalton to Resaca in the following days.
General Sherman as McPherson's commanding officer, accepted McPherson's reports on their face. He didn't have to, he might have attempted to insert his opinion of McPherson's movements into the official record, but he knew better.