..., Sickles, Sykes, and Sedgwick's troops were all before him, and on his right and left flank was a division of cavalry under Gregg and Kilpatrick respectively. The Union flanks, five miles apart on Culp's Hill and the Round Tops, were almost impregnable and difficult to turn. Lee's strategy at Chancellorsville was bold, but his determination to assault the left center of the Union army with his right cor...