This announcement marked a milestone in the military effort of the United States. When the American troops first arrived in France, they were associated in small units with the French to get primary training with the armies then in the field. Gradually regiments began to function under French division commanders. Then American divisions were formed and trained under French corps commanders. Next, American corps began to operate under French army commanders. Finally, the first American army was created, because enough divisions and corps had been graduated from the school of experience. An American division numbers 30,000 men, and a corps consists of six divisions, two of which play the part of reserves. With auxiliary troops, air squadrons, tank sections, heavy artillery, and other branches, a corps numbers from 225,000 to 250,000 men. The following were the general officers temporarily assigned to command the first five corps: First corps--Major General Hunter Liggett. Second corps--Major General Robert L. Bullard. Third corps--Major General William M. Wright. Fourth corps--Major General George W. Read. Fifth corps--Major General Omar Bundy. Seven divisions and one separate regiment of American troops participated in the counter-offensive between Château-Thierry and Soissons and in resisting the German attack in the Champagne, it was officially stated on July 20. The 42nd, or “Rainbow” Division, composed of National Guard troops from twenty-six States and the District of Columbia, including the New York 69th Infantry, now designated as the 165th Infantry, took part in the fighting in the Champagne east of Rheims. The six other divisions were associated with the French in the counter-offensive between Château-Thierry and Soissons. These divisions were the 1st, 2nd, 3rd and 4th of the Regular Army, the 26th National Guard Division, composed of troops from the six New England States, and the 28th, composed of the Pennsylvania National Guard. Marines were included in this number. The separate regiment that fought in the Champagne was a negro unit attached to the new 93rd Division, composed entirely of negro troops. It was also announced that the 77th Division was “in the line near Lunéville” and was “operating as a division, complete under its own commander.” The 42nd Division had the distinction, General March announced on August 3d, of defeating the 4th Division of the crack Prussian Guards, professional soldiers of the German standing army, who had never before failed. General March also disclosed the fact that another American division had been sent into that part of the Rheims salient where the Germans showed resistance. This was the 32nd Division. “The American divisions in the Rheims salient,” General March said, “have now been put in contiguously and are actually getting together as an American force. Southeast of Fère-en-Tardenois our 1st Corps is operating, with General Liggett in actual command.”