enemy's country went on steadily and swiftly. Tom and Jack were trained in the management of the big birds of the air, and though it was essentially different from what they had been used to in the Nieuports and the Caudrons, they soon mastered the knack of it, and became among the most expert.
"I believe I made no mistake when I picked them to be part of the raiding force," said Major de Trouville.
"Indeed you did not," agreed Lieutenant Laigney. "Their work in discovering the big guns, and their help in silencing them, showed what sort of boys they are."
And finally the day came when those who were to take part in the raid across the Rhine were to proceed to a point within the French lines from which the start was to be made.
Other Italian planes would await them there, and there they would receive final instructions. They bade farewell to their comrades in Camp Lincoln, and were given final hand-shakes, while more than one, struggling to repress his emotion wished them "bonne chance!"
This raid against one of the largest and most important of the German factory and railroad sections had long been contemplated and details elaborately worked out for it. The start was to be made from the nearest point in French-
