During the night, Longstreet arrived with two more brigades ready for action. Bragg then decided to form the Army of Tennessee into two wings for offensive action the next day. He placed General Polk in command of the right wing and General Longstreet the left. The Confederate Army, facing west between Chickamauga Creek and the LaFayette Road formed a line more or less parallel with the road. [Illustration: _Confederate line of battle in woods at Chickamauga._ From _Battles and Leaders of the Civil War_.] SEPTEMBER 20—SECOND DAY. General Bragg issued orders to his subordinates to resume the battle at daybreak. On the Confederate right Breckinridge’s Division was to begin the attack which would be taken up by successive divisions to the left. Sunday morning came. Daylight began to creep over the battlefield. The sun rose, but no attack came. Bragg waited impatiently. Finally, the orders reached Hill at 7:30 a.m. Further delay followed as the troops moved into position. About 9:30 a.m. Breckinridge advanced to attack, followed by Cleburne. The extreme left of the Union line fell back, but the fire from the Union breastworks halted further Confederate advance. Reinforcements hurried to Thomas. In further fighting at this part of the line neither side made any considerable gain, as Rosecrans sought to hold his left against Polk’s furious attacks. Almost equally matched, neither Thomas nor Polk could show any appreciable gains throughout the morning. About 11 o’clock a lull occurred as Longstreet’s wing prepared to move against the center in Bragg’s plan of attack. [Illustration: THE BATTLE OF CHICKAMAUGA SEPTEMBER 20, 1863] [Illustration: _Lt. Gen. James Longstreet._ Courtesy National Archives.] [Illustration: _Lt. Gen. Leonidas Polk._ Courtesy National Archives.] The Union center at which Longstreet pointed his attack was held by Brig. Gen. Thomas J. Wood’s Division which had replaced Negley’s Division in the line when the latter had reinforced Thomas early in the morning. To the immediate left of Wood were the troops of Brannan’s Division, and on Brannan’s left, Maj. Gen. Joseph J. Reynolds’ Division. An hour before noon as the Confederate right wing poised to strike, an irreparable blunder occurred on the Union side. A staff officer riding from Thomas’ headquarters near Kelly Field reported to Rosecrans that he had noticed Brannan’s Division was out of line and believed “General Reynolds’ right was exposed.” Rosecrans, without further investigation, immediately ordered Wood to “close up on Reynolds as fast as possible and support him.” In order to do this, Wood had to pull his division out of line and march behind Brannan’s Division toward Reynolds. Wood’s division had left its place in the line, creating a true gap where none had actually existed before, and had started to march northward behind Brannan when Longstreet’s column of five divisions accidentally struck into the gap.