Then he changed his wave length, experimenting until he got a clear series of dots and dashes.
"I think I'll take this down," he said to Boris.

"It'll be like Greek to us, of course, but it's all German wireless talk, and it all means something.

Perhaps if we're lucky, we'll stumble on to the key of the code they're using, and that might be useful." After a time Boris, who could receive well enough but was an inexpert sender, relieved him, and Fred, taking the field glass, began to search the horizon.

Soon something caught his eye and held his attention.

At first he thought he saw troops moving, coming from the east.