"Have had a few patrols since last I wrote. One at a big height—4,000 to 4,500 meters, considerably above the clouds, which almost shut out the ground below; a wonderfully beautiful sight, but beastly cold—and a couple when the clouds were low and solid. The patrol stays at just the height of the clouds, hiding in them, slipping out again to look around. If it stays below the enemy anti-aircraft guns, pepper it whenever near the lines, and at a low altitude that is rather awkward, so the patrol shows itself as little as possible.
"It's lots of sport to try to keep with the patrol; be behind the chief of patrol, see him disappear, and then bump into a fog bank, a low-hanging cloud, and not see a darn thing. Then dive down out of the cloud, wondering whether the other guy is right underneath or not; dart out of the cloud and see him, maybe 500 yards away, going at right angles. Then back up and turn around fast and give her the gear—full speed to catch up—and so on." 