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Confederate general D. H. Hill launches his attack against Silas Casey's Union division of the isolated Fourth Corps at Seven Pines.
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Hearing firing, Union general Edwin V. Sumner of the Second Corps sets his divisions in motion to move south of the rain-swollen Chickahominy River at the Battle of Seven Pines–Fair Oaks.
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After breaking several Union lines, Confederate general D. H. Hill's men run out of steam during the Battle of Seven Pines–Fair Oaks.
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Confederate general G. W. Smith's division under G. W. C. Whiting encounters the Union division under the command of Darius N. Couch near Fair Oaks.
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Union general Edwin V. Sumner's Second Corps begins to arrive on the field at the Battle of Seven Pines–Fair Oaks.
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Confederate general Joseph E. Johnston is gravely injured by a Union shell; G. W. Smith temporarily assumes command of the Confederate army.
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Confederate general D. H. Hill renews his attack, but makes little headway at the Battle of Seven Pines–Fair Oaks.
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Confederate president Jefferson Davis assigns Confederate general Robert E. Lee to command the Army of Northern Virginia after Confederate general Joseph E. Johnston is wounded at the Battle of Seven Pines–Fair Oaks.