It was the second of the Seven Days’ Battles. Gen. Robert E. Lee initiated his offensive against McClellan’s right flank north of the Chickahominy River. A.P. Hill threw his division, reinforced by one of D.H. Hill’s brigades, into a series of futile assaults against Brig. Gen. Fitz John Porter’s V Corps, which was drawn up behind Beaver Dam Creek. Confederate attacks were driven back with heavy casualties. Jackson’s Shenandoah Valley divisions, however, were approaching from the northwest, forcing Porter to withdraw the next morning to a position behind Boatswain Creek just beyond Gaines’ Mill.
References
CWSAC Battle Summaries, National Park Service (http://www2.cr.nps.gov/abpp/battles/bycampgn.htm)
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But the division arrived too late to participate in the battle which had been fought between the forces of King and Stonewall Jackson, and after a march of eighteen hours, a distance of twenty-eight miles, many of the men without a morsel to eat, they stretched their wearied limbs upon the ground to rest.
The field on which the battle was to be fought, consisted of a plateau extending from the bluffs of the river to a range of heavily wooded heights, commencing on the Rappalhannock above Fredericksburg, and extending to the valley of Massaponax, a distance of four or five miles, its greatest width being two miles.
Scarcely were the troops in battle order, before the enemy opened upon them with a number of batteries that continued to play without intermission until noon, when two of their caissons were blown up, which caused a temporary abandonment of their guns.