ut the Belgian frontier forts, and
the forts of Liege, and such big places? Wouldn't they hold them back?"

"I don't know," Freddy said. "But I suspect the Germans are doing the
same thing they did in the Polish campaign. Their light fast mobile
units scoot right on past the heavily fortified centers and capture
small positions in the rear. Then the bombers and the heavy attack
tanks, and such, go at the big forts. It's as I heard my father say
shortly after the Polish invasion. You don't have trench warfare any
more. It's blitzkrieg nowadays. Lightning attack with small fast units,
with the main body moving up behind and concentrating on main points of
defense. And don't forget Hitler's air force, Dave. It cleared the way
for him in Poland, and in Denmark, and Norway. They're probably doing
the same against the Belgians. At least until the British stop them. And
we'll jolly well stop them, don't worry."

"Gee, you talk like a regular military expert," Dave said in admiration.
"I guess your Dad taught you a lot. War certainly isn't what it used to
be, I guess. But, look, there were some blue pins on that map, and
beside each one was a date. I saw dates a week and two weeks from now.
And there were blue pins all the way across Belgium to the English
Channel. I ... Holy smokes! It just struck me. The yellow pins show
where the Germans are today, and the blue pins mark places they expect
to capture on certain days! Could that be true, do you think?"

"Yes, I do," Freddy said. "I'm pretty sure, Dave, that we've seen
something the Allied High Command would give a million pounds to see.
Five million, or more! That was an Intelligence map of the whole German
plan of invasion, Dave. I'm sure of it!"

"My gosh, then let's get going!" Dave cried, and leaped to his feet.
"We've got to get through to Allied High Command, wherever it is. We
can't show them the map, but between us we should be able to remember
enough about it to help them plenty. We...."

A wild yell from down at the base of the hill, and three pistol shots in
rapid succession, cut off Dave's words like a knife. He shot a quick
look down the hill and saw a cluster of lights suddenly spring into
being. He wasn't sure but he felt pretty certain they were from the
building where he and Freddy had been held prisoners.

A second later when more shots and more shouting drifted up to him, he
was sure. The guard had probably taken another look, and found out they
had e