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Not only were the positions for defense very well concealed on the German side, but also their machine guns and artillery could be easily placed to enfilade and take in flank all the advances which our troops made. From the heights east of the Meuse River, their artillery could be easily concealed in the woods to fire against our right flank. Our corps, observation squadrons, protected by pursuit details, photographed and joined up the reconnaissance of the whole front so as to give all the information possible about the country to the ground troops. These photos consisted not only of views taken vertically from the usual altitude of about 10,000 feet, but also of oblique views taken of the positions immediately in front of the troops at very low altitudes. The average man does not get much out of a vertical photo until he becomes expert in the art of interpreting them, but, on the other hand, an oblique view is easily understood because it looks like the view he has been used to from the top of a high mountain at the valley below. He easily appreciates the perspective. Ordinarily about eighty copies of each photo were required in active operations and the photographic section worked night and day turning out from 2,500 to 3,500 prints per day for their respective army corps.
Each opportunity was taken to make the ground troops familiar with the air units with which they had to work. This is always a very difficult thing to do, but we were making constant progress and developing additional cooperation every day. From our [[insert space]] studies [[/insert space]] of the roads and communications behind the front of our army, which in the Argonne-Meuse district were very few and bad, we had noticed particularly the lack of roads behind our centre. We always watch these things carefully because, if a tie-up or congestion in traffic occurs on a road where hundreds of motor trucks cannot move forward or backward, attack and bombardment aviation has its greatest opportunity. 
The Germans had recently systematized their attack methods of

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our|studies | = [[insert space]]