air all around them, as well as beating a lively tattoo on the armored parts of their plane.
After that they flew higher, in the hope that some enterprising Boche flier, seeing their challenge, would come over to give them battle. For half an hour, they kept this up, and then, as they tempted forth no adversary, determined to drop down once more and root out a third nest before going in for the noonday meal.
"They're at it hammer and tongs to-day for fair!" called out Morgan, as he used his binoculars and picked out spots far below where there seemed to be open fighting going on. He could discover bodies of German troops being rushed forward and then falling back with decimated ranks before a fierce flame of shot and shell poured in by Yankee batteries.
"Getting desperate, that's what!" announced Jack, starting a dip that by stages would take them down once more into the dangerous quarter of treetops under which lurked the deadly foe with his thousands of rapid-fire guns.
Other planes were in sight here and there, carrying out similar tactics with more or less success, according to the daring of the pilot In tempting the Huns beyond their power to resist. Jack determined to pass further on and see what he could unearth in a new quarter.
