Mr. Guelzo's work on General Lee provides on p. 260-261 regarding the lack of action between the armies on Sept. 18, 1862... appears inclined to believe General McClellan was attempting to use the opportunity for some kind of Coup-de-etat:
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The tale, for that's what it is. Was produced in various editorials of the early 1900s, like "The Independent" magazine in 1904, base on a second hand story:
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The story was reproduced in papers across the country after it appeared in January, 1904. But the statement of Bishop Keiley is merely that General Cobb had presumed/speculated that Gen. McClellan communicated with Lee to combine against Washington. The general view being that perhaps some "conclusion to the war" was intended (a surrender). Lee, who did not consider his army beaten or surrounded, was not inclined to negotiate...
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The newspaper editors added their own presumption that the recollection of General Cobb's reputed speculation was an evidence of McClellan's dishonorable and treasonous purpose in inquiring for communication with Lee during the daylong lull in the fighting of Sept. 18:
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Given the claims were clumsily attributed to Bishop Keiley, and Gen. Longstreet, in the papers, even those who did not believe the story were careful to discountenance it in the most courteous manner possible...
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Times Dispatch, Richmond, 1-19-1904.
Another popular anti-McClellan rumor, somewhat similar to the above, was that Lee sought for a truce to tend the wounded and bury the dead on the 18th, which McClellan was skunked into accepting... and thus Lee's army escaped across the Potomac...
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This tale was often repeated. From Rossiter Johnson's "Fight for the Republic" 1917:
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General Hancock stated, however, that there was no truce between the armies on the day after the fighting at Antietam, except among pickets, individually or by units; as various men and units collected wounded, etc.
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Relative to the claim, however, of McClellan's seeking a truce/union with Lee's army to overthrow Lincoln, etc., about thirty years before it appeared in Bishop Keiley's recollections of conversation with Longstreet, Senator A.O. Bacon of Georgia in 1872 explained what he understood from General Howell Cobb regarding the purported note from McClellan to Lee during the lull in the action of Sept. 18... viz. that it was merely an informal inquiry for the horse of the late Gen. Phil Kearney killed in action a short time before... But that General Cobb
himself wanted to employ the note as an opportunity to communicate with McClellan to seek a truce, which General Lee declined to do. Senator Bacon also claims to have conversed post-war with Judge Thomas M. Key, late of McClellan's staff, who claims McClellan too was approached by some of his officers seeking some cessation or truce in front if possible, which Key says McClellan also refused.
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Morning Oregonian, Portland, 4-3-1872.
So anyways, was it General McClellan's intent to "end the war then and there" at Antietam?
Yes. He launched a frontal attack with the intent of crushing Lee's army if possible on the 17th of September.
McClellan himself states that he did not attack Lee on the 18th of September, given his exhausted army after the fourteen hour bloodletting of the 17th, to rest, reorganize, and prepare to renew the general action on the 19th with more certain success...
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....
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