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visible by other observation. These missions were interfered with by a very powerful enemy air force and all were particularly fraught with difficulties, especially the photographic missions which were most important. The 1st and 12th Squadrons divided the camera work as their Salmsons were much better adapted than the Sopwiths of the 88th. From them, our staff received timely and important information and, in addition, a certain number of artillery adjustments and contact patrols were carried out.

The enemy was everywhere held. With the exception of the attack on Vaux no other action took place before July 15th which required infantry contact patrol. Opportunity in this period was afforded to carry out some infantry liaison exercises behind the lines. 

In fire adjustments there was difficulty in obtaining or locating and reading the ground signals necessary, due to lack of training of panel crews and material. On the part of the Air Service, certain failures arose due to,inability to notify the Artillery P.C. when it was impossible to dispatch an airplane at the prearranged hour and improper replacements of material. None was due to insufficient training of observer personnel, as all assigned to artillery work were well fitted