was hit, and they continued on their way, keeping at a good height,
as did their associates, until they were well over the front German
lines.

Jack noticed that some of the other planes were dropping lower, to
give their observers a chance to do their work, and, in response to
a shove in his back from the powerful field glasses carried by
Harris, Jack sent his machine down to about the nine-thousand-foot
level. By a glance at the map he could see that they were now over
the territory concerning which a report was wanted.

They were now under a heavy fire from the German anti-aircraft guns,
but Jack was too old a hand to let this needlessly worry him. He
sent his machine slipping from side to side, holding it on a level
keel now and then, to enable Harris to get the photographs he
wanted. In addition, the observer was also making a hasty, rough,
but serviceable map of what he saw.

Jack glanced down, and noted a German supply train puffing its way
along toward some depot, and he headed toward this to give Harris a
chance to note whether there were any supplies of ammunition, or
anything else, that might profitably be bombed later. He also saw
several columns of German infantry on the march, but as they were
not out to make an attack now, they had to watch the Huns moving up
to the front line trenches, there later, doubtless, to give battle.

Back and forth over the German lines flew Jack, Harris meanwhile
doing important observation work. As Jack went lower he came under
a fiercer fire of the batteries, until, it became so hot, from the
shrapnel bursts, that he fain would have turned and made for home.