Battle of Gaines Mill [US]
Battle of First Cold Harbor [CS]
Battle of the Chickahominy [Alternate]
John Bell Hood [CS] and George Pickett [CS] breakthrough Fitz John Porter's [US] line, forcing Union troops south of the Chickahominy River and severing McClellan's supply line to Eltham's Landing (White House, West Point)
General Braxton Bragg [CS] tries to split General William Rosecrans [US] forces as they try to return to the safety of Chattanooga. A second day breakthrough at the Brotherton Cabin forces the federals into a retreat, halted only by the Rock of Chickamauga, General George Thomas on Snodgrass Hill
The bloodiest two days in American history cost the Federals 1,657 dead, 9,756 wounded, and 4,757 missing for a total of 16,170 casualties out of 58,000 troops. The Confederate losses were 2,312 dead, 14,674 wounded and 1,468 for a total of 18,545 out of 66,000 troops.
William Hardee, D. H. Hill and A. P. Stewart combine to attack Slocum's wing on the federal advance. In spite of initial gains they are repulsed. Sherman reinforces Slocum on the second day and Slocum nearly enveloped the Confederate forces on the third day.
Riding south to Malvern Hill, Daniel Harvey Hill questioned a pastor about about the retreating bluecoats. The man of the cloth described a strong Union position on either side of Willis Church Road south and east of where the road crossed Western Run. Hill road to Lee, repeated the man's description and recommended "...leaving McClellan alone."