 Complete the following phrase:  Grants armies converged on Chattanooga and planned to attack Braggs army. Getting into place required the XI and XII Corps to cross the Tennessee River at Bridgeport, Alabama, and march rapidly for Lookout Valley, opening the supply line to Chattanooga. They did so, to the surprise of the Confederate forces there, which had not expected an attack from that quarter. On October 28, Hookers two corps were attacked by a part of Braggs army, which had by now been joined by Longstreet and some units from the Army of Northern Virginia. Bragg ordered Longstreet to drive the federals back and he attacked. In the ensuing Battle of Wauhatchie, the XII Corps took the brunt of the initial assault. Hooker bypassed Howard and ordered Schurz to bring up the XI Corps to join the fight. The engagement was confused on both sides, but the Union forces were victorious, driving off the rebels and inflicting twice the casualties they received. With the supply lines now reopened to Chattanooga, Grant planned to dislodge Braggs army. At the Battle of Lookout Mountain, the 68th was held in reserve on the first day, November 24. The battle continued the next day and a part of Howards XI Corps, including the 68th, was shifted to the far left of the Union lines to reinforce Shermans 