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was very arduous and difficult. despite the vigorous an superior aerial effectiveness which failed not to inflict losses, our command was kept adequately and exactly informed of enemy movements.
  Corps Observation: Dawn and twilight reconnaissances, battery locating, artillery adjustment and photography were accomplished. A complete assemblage of very sharp obliques was secured covering the Vesle front and during the six weeks of the 3rd corps' work the front opposite was photographed to a dept of 12 kilometers.
  Upon each of the occasions when the forcing of the passages of the Vesle was attempted planes were sent out on infantry liaison work, but at first with small success, as panels were rarely shown and the covered terrain made it difficult for airplanes to identify troops.
  An Infantry Contact school wasestablisehd by the G.A.S., three days to each division, wth detachments of 1200 each from rifle companies , machine gun battalions and headquarters taking the instruction. Practical terrain manoeuverers were accomplished each day of the course. Returning from the lectures and exercises these men spread the gospel and appreciable results were produced. The cooperation with the artillery was not altogether satisfactory, poor radio liaison being the cause of many failures.