Burnside examined Lee's 8 mile long line and saw that it bowed inwards in the center. He could not attack there without coming under crossfire from the flanks. That left the two flanks, and he decided to attack both. However, his orders were not for the forceful attack his subordinates expected. Franklin, on the Union left, was instructed to send forward at least one division to seize the high ground, as was Sumner, supported by Hooker, on the right. Burnside thought that he would simply be able to brush Lee off without committing all of his forces. He would find out the next day how wrong he was.