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were constantly in the air during daylight and furnished valuable results as a source of information. This offensive had been anticipated, had been confirmed by the Air Service, and plans had been prepared in detail. 
It spent its force, was completely checked, and no real developments resulted from point of view of corps air service tactics. While the American air units were assigned to specific units of the troops engaged in the German offensive, yet all our corps observation and pursuit units turned their attention to this sector, and, in fact, an American plane was the first to report that the enemy was crossing the Marne by pontoon bridges. 

  Pursuit. In these few days the First Pursuit Group changed from the Nieuport XXVIII to the Spad XIII, still keeping up operations despite German aerial supremacy, increased difficulties in adjustments and repairs on the Spad and the greenness of the mechanics with this type; and it set a new standard for the amount of work a pursuit group could do. The squadrons changed their activity and covered as far as possible, the new area of attack. 

Third Phase

  Corps Observation. In the advance of the 1st Corps to the Vesle