At eleven o'clock at night of April 2d, Johnston learned that Buell was moving "rapidly from Columbia, by Clifton, to Savannah." About one o'clock in the morning of Thursday, the 3d, preliminary orders were issued to hold the troops in readiness to move at a moment's notice, with five days' rations and one hundred rounds of ammunition. The movement began in the afternoon. The army was arranged in three corps, commanded respectively by Polk, Bragg, and Hardee, and a reserve under Breckenridge. Beauregard was second in command, without a specific command. Major-General Hardee's corps consisted of Brigadier-General Hindman's division and Brigadier-General Cleburne's brigade. The division consisted of Hindman's brigade, commanded by Colonel Shaver, and Brigadier-General Wood's brigade. Wood's brigade comprised five regiments, and two battalions of infantry and a battery; Cleburne's brigade was composed of six regiments and two batteries. Major-General Bragg's corps consisted of two divisions, commanded respectively by Brigadier-General Ruggles and Brigadier-General Withers. The brigades of Ruggles' division were commanded by Colonel Gibson, Brigadier-General Patton Anderson, and Colonel Pond. Withers' brigades were commanded by Brigadier-Generals Gladden, Chalmers, and Jackson. The brigades of Chalmers and Gladden contained each five regiments and a battery; the other brigades contained each four regiments and a battery, with, in Anderson's and Pond's each, an additional battalion of infantry. Major-General Polk's corps had two divisions, commanded by Brigadier-General Clark and Major-General Cheatham. Clark's brigades were commanded by Colonel Russell and Brigadier-General A.P. Stewart; Cheatham's brigades were commanded by Brigadier-General B.R. Johnson and Colonel Stephens. Each brigade was made up of four regiments of infantry and a battery. Brigadier-General John C. Breckenridge's reserve comprised three brigades, commanded by Colonel Trabue, Brigadier-General Bowen, and Colonel Statham. Trabue had five regiments and two battalions, Bowen four regiments, and Statham six regiments of infantry. Each brigade had a battery. By the returns, Cleburne's brigade was the largest, having 2,750 effectives. Besides, were three regiments, two battalions and one company of cavalry. This force comprised 40,000 of the 50,000 effectives gathered at Corinth. Different returns vary a few hundred more and a few hundred less. General Johnston telegraphed to Jefferson Davis, when the movement began, that the number was 40,000. In forming for battle, the army was to deploy into three parallel lines, the distance between the lines to be one thousand yards. Hardee's corps to be the first; Bragg's the second; and the third to be composed of Polk on the left and Breckenridge on the right.