...and skill, this movement was discovered early in the day by Sickles, whose corps (Third) was next to Howards (Eleventh), the latter constituting the extreme Federal right flank. Soon after 8 A. M., Sickles was aware of the movement of a strong column across his front. At half-past 9 Hooker ordered Slocum and Howard to look well to the right flank, as the enemy was moving in that direction. Sickles ...