Jack and the others had gotten used to the bursts of shrapnel all around them. They could see the puffs of smoke where the shells burst, but they could hear no sounds.
"The 'Archies' are busy this morning," thought Jack, as he noted the firing from below, and using the French slang word for the German anti-aircraft guns.
He took a quick glance toward Tom's machine to make sure his chum, so far, was all right. Assured on this point Jack looked to his own craft.
"Well," he mused, "at this point the 'flaming onions' can't get us, but they may pot us as we go down, as we'll have to if we want to get a good view of the ground where the big gun may be hidden."
The "flaming onions," referred to by Jack, were rockets shot from a ground mortar. They have a range of about a mile, and when a series of them are shot upward in the direction of a hostile plane it is no easy matter for the aviator to pass through this "barrage." Once a "flaming onion" touches an aeroplane the craft is set on fire, and then, unless a miracle happens, the aviator falls to his death.
The German gunners, however, could not use these to advantage while the French planes kept so high up, though the shrapnel was a menace,
