"But this is a sure go; the lieutenant told me so a few minutes ago," responded Alfred.

"Is the lieutenant going, do you know?" asked Ralph.

"Yes, I suppose that is why he told me about it," answered Alfred.

"I wonder whether they will let us go with him?" asked Ralph.

"Well, I didn't ask him, but I looked at him pretty hard, and I guess he knows how we feel about it," answered Alfred.

The rumor turned out to be true, for the following day orders were formally received to prepare eighteen machines for a raid to the Rhine. The lieutenant announced the news to the boys, and added: "I suppose, of course, you wouldn't like to go on such a venturesome mission?"

"Go!" exclaimed both boys in unison.

The lieutenant laughed. "Well, if you insist on it I shall have to take you with me. The Seraph (which was the name of their airplane, although it was officially known as No. 47) will be fixed to carry a dozen bombs for the occasion."

"But how about the quick firer?" asked Ralph.

"We must dispense with that on this trip. Bombs are more valuable," answered the lieutenant.