"I don't agree with that, Dave," Freddy said. "The German blitzkrieg in Poland made as much as eighty and ninety miles in a day. Besides, my father taught me a lot about marking army maps. Of course I don't know what all of those markings meant on the Colonel's map, but I'm pretty sure those little yellow pins represented their advanced armored scouting units."

"But good gosh, they were as far west as Brussels and Charleroi!" Dave gasped. "That's miles away. What about 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 escaped. Now the alarm was being given. Bitter anger for wasting time talking flashed through him and was gone. He reached down quickly and pulled Freddy up onto his feet.

"They've discovered our escape!" he cried. "We've got to start moving, and fast. Stick close to me. We'll still head north."

"But why north?" Freddy protested. "We should go west if we want to reach the Belgian outposts as soon as possible, and get them to take us to Allied G.H.Q., Dave!"