Nelson's division reached there the evening of the 5th, of which Grant had notice. Buell arrived about the same time, but did not report his arrival, or attempt to do so until 8 A.M. the 6th, when Grant had gone to Pittsburg Landing to take personal command in the battle then raging with great fury.
It is well to remember that General Grant, on whom the responsibility of the campaign and impending conflict rested, had been actually present with his army but twenty days when the battle commenced; that he did not select the position of the advance divisions of his army, and could not, if he had chosen to do so, have changed the place of the junction of Buell's army with his, as Halleck had fixed upon Savannah as that place, and Buell was slowly marching towards it before Grant's arrival there.
The unfriendly disposition of Halleck and the lack of cordiality of Buell towards Grant made matters extremely embarrassing. Buell was Grant's junior, but he had commanded a department for a considerable time while Grant only commanded a district, and this alone may account for a natural reluctance on Buell's part to serve under him. Had Buell's army arrived promptly on the Tennessee, the battle of Shiloh would not have been fought, as both Johnston and Beauregard determined the attack was only practicable before Grant's and Buell's armies united.
Grant was seriously injured, after dark on the 4th of April, while returning to Pittsburg Landing in a rain storm from investigating some unusual picket firing at the front. His horse had fallen on him, injuring his leg and spraining an ankle so much that his boot had to be cut off. He was unable to walk without the aid of crutches for some days after the battle.( 7)
In the controversy as to whether the Union Army at Shiloh was surprised on the morning of the first day I do not care to enter. The testimony of Sherman and his brigade commander, General Ralph P. Buckland, as well as that of Grant, will all of whom I have conversed on this point, should be taken as conclusive, that as early as the 4th of April they knew of the presence of considerable organizations of Confederate cavalry, and that on the evening of the 5th they had encountered such numbers of the enemy as to satisfy the Union officers on the field that the enemy contemplated making an attack; yet it is quite certain these officers did not know on the evening of April 5th that the splendidly officered and organized Confederate Army was in position in front and close up to Shiloh Church as a centre, in full array, with a definite plan, fully understood by all its officers, for a battle on the morrow. Nothing had gone amiss in Johnston's plan, save the loss of one day, which postponed the opening of the attack from dawn of Saturday to the same time on Sunday. The friends of the Confederacy will never cease to deplore the loss, on the march from Corinth of this one day. Many yet pretend to think the fate of slavery and the Confederacy turned on it. Grant was not quite so well prepared for battle on Saturday as on Sunday, and no part of the Army of the Ohio could or would have come to his aid sooner than Sunday. Grant, however, says he did not despair of success without Buell's army,( 7)
Grant, when the battle opened, was nine miles by boat from Pittsburg Landing, which was at least two more miles from Shiloh Church, where the battle opened. Up to the morning of the battle he had apprehensions that an attack might be made on Crump's Landing, Lew Wallace's position, with a view to the destruction of the Union stores and transports.( 7) He heard the first distant sound of battle while at Savannah eating breakfast,( 7) and by dispatch-boat hastened to reach his already fiercely assailed troops, pausing only long enough to order Nelson to march to Pittsburg Landing and, while en route, to direct Wallace, at Crump's Landing, to put his division under arms ready for any orders. Certain it is that the Union division commanders at Shiloh did not, on retiring the night of the 5th, anticipate a general attack on the next morning. They took, doubtless, the usual precautions against the ordinary surprise of pickets, grand-guards, and outposts, but they made no preparation for a general battle, the more necessary as three of the five divisions had never been under fire, and most of them had little, if any, drill in manoeuvres or loading and firing, and few of the officers had hitherto heard the thunder of an angry cannon- shot or the whistle of a dangerous bullet. But it may be said the private soldiers of the Confederate Army were likewise inexperienced and illy disciplined. In a large sense this was true, though many more of the Confederate regiments had been longer subjected to drill and discipline than of the Union regiments, and they had great confidence in their corps and division commanders, many of whom had gained considerable celebrity in the Mexican and Indian Wars.
The corps organization of the Confederate Army, in addition to the division, gave more general officers and greater compactness in the handling of a large army. At this time corps were unknown in the Union Army. And of still higher importance was the fact that one army came out prepared and expecting battle, with all its officers thoroughly instructed in advance as to what was expected, and the other, without such preparation, expectancy, or instruction, found itself suddenly involved against superior numbers in what proved to be the greatest battle thus far fought on the American continent. The Confederate hosts in the early morning moved to battle along their entire front with the purpose of turning either flank of the imperfectly connected Union divisions, but their efforts were, in no substantial sense, successful. The reckless and impetuous assaults, however, drove back, at first precipitately, then more slowly, the advance Union divisions, though at no time without fearful losses to the Confederates. These heavy losses made it necessary soon to draw on the Confederate reserves. The Union commanders took advantage of the undulations of the ground, and the timber, to protect their men, often posting a line in the woods on the edge of fields to the front, thus compelling their foes to advance over open ground exposed to a deadly fire. The early superiority of the attacking army wore gradually away, and while it continued to gain ground its dead and wounded were numerous and close behind it, causing, doubtless, many to straggle or stop to care for their comrades. It has been charged that much disorganization arose from the pillage of the Union captured camps. The divisions of Hurlburt and W. H. L. Wallace were soon, with the reserve artillery, actively engaged, and, save for a brief period, about 5 P.M., and immediately after, and in consequence of the capture at that hour of Prentiss and about 2000 of his division, a continuous Union line from Owl Creek to Lick Creek or the Tennessee was maintained intact, though often retired.
In the afternoon, so desperate had grown the Confederate situation, and so anxious was Johnston to destroy the Union Army before night and reinforcements came, that he led a brigade in person to induce it to charge as ordered, during which he received a wound in the leg, which, for want of attention, shortly proved fatal. To his fall is attributed the ultimate Confederate defeat, though his second, Beauregard, had written and was familiar with the order of battle, and had then much reputation as a field general. He had, in part at least, commanded at Bull Run. Beauregard now assumed command, and continued the attack persistently until night came. No reinforcements arrived for either army in time for the Sunday battle. Through some misunderstanding of orders, and without any indisposition on his part, General Lew Wallace did not reach the battle-field until night, and after the exhausted condition of the troops of both armies had ended the first day's conflict. The Army of the Tennessee, with a principal division away, had nobly and heroically met the hosts which sought to overwhelm it; some special disasters had befallen two of its five divisions in the battle; General W. H. L. Wallace was mortally wounded, and Prentiss captured, both division commanders; the Union losses in officers and men were otherwise great, probably reaching 7000 (first day of battle), yet when night came the depleted Army of the Tennessee stood firmly at bay about two miles in rear of its most advanced line of the morning. Colonel Webster, of Grant's staff, had massed, near and above Pittsburg Landing, about twenty pieces of artillery (pointed generally south and southwest) on the crest of a ridge just to the north of a deep ravine extending across the Union left and into the Tennessee. Hurburt's division was next on the right of this artillery, extending westward almost at right angles with the river. A few troops were placed between the artillery and the river. The gunboats Tyler and Lexington, commanded, respectively, by naval Lieutenants Grim and Shirk, were close to the mouth of the ravine, and when the last desperate attack came their fire materially aided in repulsing it. Next on Hurlburt's right came McClernand's division, also extending westward; then Sherman's, making almost a right angle by extending its right northward towards Snake Creek, to the overflowed lands and swamp just below the mouth of Owl Creek. Broken portions of other divisions and organizations were intermixed in this line, the three divisions named being the only ones on the field still intact.( 8) In this position Grant's army received at sunset and repelled the last Confederate assault, hurling back, for the last time on that memorable Sunday, the assailing hosts. Dismayed, disappointed, disheartened, if not defeated, the Confederate Army was withdrawn for bivouac for the night to the region of the Union camps of the morning. After firing had ceased, Lew Wallace reached the field on Sherman's right.
It is known that many stragglers appeared during the day in the rear of the Union Army, and soon assembled near the Tennessee in considerable numbers. The troops were new and undisciplined, and it was consequently hard for the officers to maintain the organizations and keep the men in line; but it is doubtful whether the number of stragglers, considering the character of the battle, was greater than usual, and they were not greater than, if as great as, in the rear of the Confederate Army. An advancing and apparently successful army in battle usually has comparatively few stragglers in the rear, but the plan of fighting adopted by Johnston and Beauregard, in masses, often in close column by regiments, proved so destructive of life as to cause brave men to shrink from the repeated attacks.
However, the gallantry displayed by the attacking force, and the stubborn defensive battle maintained by the Union Army, have seldom, if ever, been excelled or equalled by veteran troops in any war by any race or in any age.