 Early the next day , Tuesday , July 1 , McClellan , having come from nearby Haxall 's Landing the night before , examined his army 's battle line on Malvern Hill . His inspection left him worried most about the Union Army 's right ( eastern ) flank , which lay behind Western Run . Western Run was an area necessary for McClellan 's plans to relocate to Harrison 's Landing , and he feared an attack might come from there . As a result , he posted the largest portion of his army there : two divisions from Edwin Sumner 's II Corps , two divisions from Brig. Gen. Samuel P. Heintzelman 's III Corps , two divisions from Brig. Gen. William Franklin 's VI Corps and one division from Maj. Gen. Erasmus Keyes 's IV Corps , who were stationed across the James . The division under Brig. Gen. George McCall , badly damaged in the fighting at Glendale with McCall himself wounded and captured , was held in general reserve . 
