later. However, the units of the 31st did not begin concentration until 25 August, when Major General Francis Joseph Kernan took command. Kernan was replaced by 56th Field Artillery Brigade commander Brigadier General John Louis Hayden, the senior brigade commander, on 18 September. The division included the 61st and 62nd Infantry Brigades and the 56th Field Artillery Brigade by the end of the concentration period. The 61st included the 5th Georgia Infantry, separate Georgia infantry companies, and detachments of the 1st and 2nd Georgia and 1st Florida Regiments of Infantry; the 62nd included the 1st Alabama and 2nd Florida Infantry, and detachments of the 1st Florida and 1st Georgia Regiments of Infantry and of the 1st Alabama Cavalry; the 56th included detachments of the Georgia Field Artillery, the 1st Florida, 1st Georgia, and 2nd Alabama Regiments of Infantry, and of the 1st Alabama Cavalry. On 1 September, the 31st was reorganized in accordance with the tables of organization of 8 August, which called for a square division with four infantry regiments. As a result, the 61st Brigade included the 121st and 122nd Infantry with the 117th Machine Gun Battalion, the 62nd included the 123rd and 124th Infantry with the 118th Machine Gun Battalion, and the 56th included the 116th, 117th, and 118th Field Artillery Regiments with the 106th Trench Mortar Battery. During October, the division was reinforced with 10,000 men from Alabama, Florida, and Georgia, transferred from Camps Gordon, Jackson, and Pike, as it began systematic training on 22 October. On 15 March 1918, Major General Francis H. French became division commander; he was replaced by Major General LeRoy Springs Lyon two months later. The 31st transferred almost all of its infantry privates and about half of its artillery privates from November to June, including 4,300 who were sent to Camp Merritt. In June, 9,200 men from Michigan and Illinois transferred to the division, followed by 5,700 from Illinois in July. By 21 July, the division fielded 24,000 men, with its officers mostly from the Organized Reserve Corps and the National Army. The 56th Field Artillery Brigade left to train at Camp Jackson on 24 July, while the 2nd Battalion, 122nd Infantry relocated to Camp Greene on 20 August. During the latter month, 2,000 men, including 1,200 from Camp Travis, joined the 31st. On 28 September, 61st Brigade commander Brigadier General Walter Alexander Harris took command of the division, leading