American Battlefield Trust’s map of the Battle for Culp’s Hill, Gettysburg
Just as twilight was bringing an end to the fighting on the Union left, Confederate Gen. Richard S. Ewell's assault on the opposite flank was about to commence. A half an hour before sunset, the division of Gen. Edward "Allegheny" Johnson began its long charge up the steep slopes of Culp's Hill. Opposing Johnson's 4,700 Confederates, roughly 1,600 New Yorkers under Gen. George Sears Greene were charged with holding the extreme right flank of the Union Army and protecting its supply line, the Baltimore Pike.
Under the light of a full moon, Johnson's men made their assault, only to run headlong into formidable breastworks erected by Greene's troops. Gen. Maryland Steuart's brigade managed to outflank the Yankees, who merely fell back to another line or breastworks. Increasing darkness led to great confusion as both sides tried to blindly feed reinforcements into the fight. The battle for Culp's Hill would resume at daylight.