 Complete the following phrase:  On 22 November, the 80th Illinois set out toward Chattanooga and arrived in the evening east of town. The next day, on 23 November, the regiment engaged with the enemy and took the first line of rifle splits as part of the XI Corps, driving on the left flank in the enemys skirmishers. The 80th Illinois laid in line of battle all night. This advance was part of the Union Army of the Tennessee under Maj. Gen. William T. Sherman maneuvering to launch a surprise attack against Braggs right flank on 