The first of Sumner’s divisions, French’s division, crossed the creek at about 7:30. If you have information suggesting otherwise, then provide it. Otherwise, your claims are worthless.
As I told you, everyone else says otherwise.
In sum, known timings are:
Sumner: says he didn't receive the order until 0720. A letter from his son clarifies that he'd sat on the steps of Hooker's old HQ for an hour waiting for someone to find him.
French's Division: French says he did receive an order from Sumner until 0730, however reports from Morris' and Kimball's brigades place the time they started marching at 0600, with them forming line of battle west of the Antietam at 0730-0800. They advanced towards the Sunken Road before 0900, as everyone agrees the assault began at 0900.
Sedgwick's Division: The brigadiers give the timings they started marching as 0630 (Dana), 0700 (Howard) and 0720-30 (Gorman and one of his COs). This fits with their forming line at 0800 (see Col Owen's report), and entering the West Woods at 0900 after conducting a recce. Williams report says Sumner reinforced him before 0900.
This would fit with McClellan carrying out his stated intent of having French and Sedgwick march at dawn. French's division marched off first at 0600. The brigades of Sedgwick went west instead of north and crossed the Antietam at 0630, 0700 and 0730 respectively. By 0800 both are formed west of the Antietam, and by 0900 both are attacking. Sumner of course has a missing hour during this, whilst he's sitting outside Hooker's old HQ. What we know is he wasn't handed the order until 0720. The order was likely issued
Reports you've not cited.
Gorman, commanding 1st Bde of Sedgwick's Division:
"On the morning of that day I received orders to march, and
at about twenty minutes past 7 o'clock a. m. of that day we took up the line of march. After crossing the Antietam Creek and arriving at an open field about there-quarters of a mile from the enemy's position three lines of battle were formed, my brigade being in the advance and front."
Suitor of the 34th New York:
"In the evening of that day I received an order to be prepared to march at daylight on the morning of the 17th instant. In obedience to said order, I was under arms with my command, and so remained until the order was given to move,
which
was about 7.30 o clock A.M. We moved in a northwesterly direction."
Howard, commanding 2nd Bde of Sedgwick's Division:
"The division, consisting of General Gorman's, General Dana's, and General Burns' brigades, commanded by myself, left camp near Keedysville about 7 a.m., and proceeded in three lines, moving by the right flank in a westerly direction, forded the Antietam, ascended a gentle slope, continuing in the same direction for about a quarter of a mile beyond"
Dana, commanding 3rd Bde of Sedgwick's Division:
"The regiments were accordingly ready,
but orders were not received to march till 6.30 o'clock a.m., when I proceeded, in company with the First and Second Brigades, on my left and right respectively, to the right wing of the Army, where Hooker's corps was already engaged with the enemy's left."
Kimball's Bde
Harrow of the 14th Indiana:
"
On the morning of the 17th instant, in obedience to your order, my regiment moved forward on the right of the brigade, advancing rapidly toward the enemy, who were then engaging our line. We passed through an orchard, emerging into a plowed field, receiving during the execution of this movement a rapid fire from the enemy; this about 8 o'clock a. m. We ascended the hill in our front and occupied the crest, from which position we engaged the enemy, sheltered under ditches [the Sunken Road], rocks, and fences, with a large reserved force in a field of [Piper's] corn in their rear. The contest here continued for near four hours, during all which time the enemy poured upon us a terrific and murderous fire from infantry, also of grape and shell, thrown from a battery on our right and front. In our immediate front as many as eight stand of rebel colors were exhibited at a time."
Snider of the 7th Virginia:
"In obedience to your order on the morning of the 17th instant, we took our position in line of battle on the extreme left of your brigade, and, in further obedience of your orders, moved forward at 8 o'clock, at which time we engaged the enemy, who were drawn up in large force."
Wilcox of the 132nd Pennsylvania:
"We were ordered by you to take up the line of march about 6 o'clock a. m., and were formed in line of battle at 7 o'clock. We were brought under fire a little before 8 o'clock"
Morris's Bde
Palmer of the 108th New York:
"I have the honor to report that on the 17th instant my command
left camp near Keedysville about 6 o'clock in the morning, and, after marching about 2 miles, having formed into line of battle, entered into action on the crest of the hill on the left of the brigade in the front line of battle, and in front of the [Roulette] corn-field and rifle-pits [Sunken Road] occupied by the rebels.
The action commenced about 7.30 o'clock in the morning. My command remained in line, and continued in position, firing with great rapidity and energy, in the face of a deadly fire of the enemy, who were stationed in the corn-field and rifle-pits, not more than 20 or 30 rods distant, until about 12.30 o'clock in the afternoon."
Perkins of the 14th Connecticut wrote:
"We broke bivouac at camp near Keedysville, Md., on the morning of the 17th of September, taking position on the right of your command according to order, and marched about two hours by flank, when we formed line of battle and moved forward a distance of about one-half mile, where we became engaged, our position being in a corn-field west of William Roulette's farm-house, the enemy occupying a position on the summit of a hill to our front." - consistent with marching out at 0600 (see Palmer, his brigade mate) and forming before 0800
Zinn of the 130th Pennsylvania contradicted the other two:
"About 8 o'clock on the morning of the 17th instant we left our camp, on the south side of the Sharpsburg pike, and marched by a flank movement to a point about 1 1/2 miles north, where a line of battle was formed." - however, biring in a single sentence this may be the time of forming line. The others disambiguate.
(No timings for Weber's Bde)