Though they were fired at viciously, neither Jack nor his companion 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. But orders were orders, and Harris had not yet indicated that he had enough.
Twisting and turning, to make as poor a mark as possible for the enemy guns, Jack sent his machine here and there. The other pilots were doing the same. Machine guns were now opening up on them, and once the burst of fire came so close that Jack began to “zoom.” That is he sent his craft up and down sharply, like the curves and bumps in a roller-coaster railway track.
By this time the leading plane gave the signal for the return, and, thankful enough that they had not been hit, Jack swung about. But the danger was not over. They had yet to pass across the enemy's front line trenches, and when Harris signaled Jack to go down low in crossing the lad wondered what the order was for. It was merely that the observer wanted to see what was going on there so he could report.
They went down to within a mile of the earth, and several times the plane was struck by pieces of shrapnel or bullets from machine guns. Twice flying bits of metal came uncomfortably close to Jack, but he was kept too busy with the management of his machine to more than notice them. Harris was working hard at the camera and the maps.
Then, suddenly, came the danger signal from the leading plane, and only just in time. Out from the German hangars came several battle machines. Harris dropped his pencil and got ready the automatic gun, but it was not needed, for, after approaching as though about to attack, the Huns suddenly veered off. Later the reason for this became known. A squadron of French planes had arisen as swiftly to give battle, and however brave the Hun may be when he outnumbers the enemy, he had yet to be known to take on a combat against odds.
So Jack and his observer safely reached the aerodrome again, bringing back much valuable information.