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Of this liaison and education the air forces assumed the full burden.
  Corps Observation. Curing the preparation from September 14 and the offensive itself to November 11, low clouds and fog obsucred the group almost every morning and afternoon and only rarely was a good flying day had. In consequence, photographs taken in momentary break in the clouds, were limited to those of only the most important points. Pursuit or biplace protection was invariable furnished. Artillery surveillance missions were very successful whenever the weather permitted, much information being sent by radio or by messages dropped at Artillery P.C.'s. On adjustments and fugitive targets the success was not great, owing to the constant movement; the best successes being in the 5th Corps where special observers had been detailed on this work. Radio liaison was markedly unsuccessful and only dropped messages were satisfactory ordinarly. Only the heaviest rain or fog stopped the visual reconnaissances, which represented the most important work done next to infantry liaison, and they kept the corps and divisional staffs informed of enemy movements. During many periods they were the sole source of information.
  Particular attention was given by the Air Service to develop