"Quick!" said Hal, and increased his pace, swerving from side to side as he ran, making it difficult for the Germans to aim accurately.

Chester did likewise, and soon they were safe once more beneath the protection of the great trees.

But now that they had been discovered, the lads knew that it was to be a race for life. They knew that it was but a question of a few minutes until the remaining Germans would again mount their motorcycles and give chase. Also they realized that their chances of eluding their pursuers were much more slight in broad daylight than they had been in the darkness.

Therefore they ran at top speed. While they were not afraid and had not lost a whit of their nerve, they realized that discretion was the better part of valor, and their feet continued to hit the ground at breakneck speed, until again came to their ears the first faint sounds of the pursuing motorcycles. Gradually the sounds became more distinct, this telling the boys that their pursuers were gaining rapidly, although the rough condition of the ground made it impossible for the motorcycles to travel very fast.

Finally, when he could run no more, Hal threw himself to the ground, and Chester immediately followed his example. For a few moments they lay there, panting, their tongues literally hanging out like worn out dogs.

Then they sprang to their feet again, and making an abrupt turn to the right plunged into the underbrush right where it was the most dense.

Here Hal espied a large tree, with low hanging branches. With Chester by his side he rushed for it.

Hal stood aside while Chester grabbed the lowest branch and swung himself up, and then he followed suit. High up in the tree the lads climbed, the close set branches affording an excellent screen.

Half a minute later six motorcycle riders hove into sight, hardly a hundred yards from where the boys were perched.

Chester's fingers twitched on his revolver, but Hal, who had noticed the set expression on his friend's face, uttered a low warning.

And the sound of Hal's voice was almost their undoing. For the Germans had come to a pause and Hal's words carried plainly in the silence to their ears.

For a moment the Germans glanced about hurriedly, seeking out their prey. Then they sprang behind trees themselves, their rifles ready to fire. They had not yet discovered the boys' hiding place, and were fearful of a shot from ambush.

Then one, raising his eyes, saw Hal, and quickly raised his rifle. But Hal's eye was keen also, and before the German could press the trigger Hal's revolver spoke and the German tumbled to the ground.

Chester fired at the same moment as did Hal, and a second German clapped his hand to his head and reeled. But before the other pursuers could raise their rifles, there came from ahead a sound that brought a loud "Hurrah" from Hal and Chester, and a moment later, on the dead run, came a small body of British infantry.

Quickly the Germans leaped onto their motorcycles and turned to run.

But now the advancing British were in full view, and a voice of command rang out:

"Fire!"

A volley rang out. Not in all the world were there better marksmen than those British troopers. Four Germans reeled in their saddles and tumbled to the ground.

Hal and Chester descended from their place of refuge.

CHAPTER XVIII.

ON A NEW MISSION.

The two lads hurried up to the officer in command of the English troops.

"You arrived just in time," cried Hal, grasping the hand the officer extended.

"I should say you did," declared Chester, also shaking the officer's hand. "A few moments later and we would have been goners, sure."

"Well, I am glad we arrived so opportunely," said the officer, laughing a little. "We heard shooting in this direction last night, but we did not get an order to advance until this morning. As you may perhaps have surmised, we are part of the advance guard of the army."

"Do you mean the French and English have both a.s.sumed the offensive in force?" demanded Hal.

"Exactly," replied the British officer. "We are not far in front, and are pushing slowly along, that we may take the Germans by surprise, if possible. Perhaps you may have gathered some information as to the German position and strength?"

This last was in the form of a question, and the lads made haste to answer in the affirmative.

"We have not learned a whole lot," Chester continued, "but we have a little information that may be of value."

"Then you had better hasten back to General French and report," said the officer. "I am sure he will be glad to have any information you may be able to give him."

The lads thanked the officer, and soon the little troop was on the advance again. Hal and Chester resumed their journey in the opposite direction. For an hour they hurried along, occasionally meeting a detachment of mounted troops going forward, but they had traversed at least five miles before they made out in the distance the first long line of the British advance.

It was indeed an imposing sight, this long line of khaki-clad men, marching rapidly toward them, and Hal and Chester were not unmindful of it, and their hearts swelled with pride at the thought that they themselves were a part of this great fighting machine.

They hurried on toward the advancing army. Already the lads had been challenged several times, but upon explaining their predicament had been allowed to continue on their way. Now they reached the first line of the advancing host, and an officer hastily rode toward them.

Upon a glance at their uniforms, now unkempt and dirty, he saluted.

"What is your business here?" he demanded.

Briefly Hal explained, and added:

"We are seeking General French. Can you direct us to him?"

The officer did as requested and the lads made off in the direction he indicated. It was fully two hours later before they were admitted to the presence of the commander-in-chief of the small though mighty host of Britain.

For once the English field marshal lost his habitual calm and greeted them warmly.

"I had made sure that you two lads were lost," he said. "Come, give an account of yourselves."

Chester did so as briefly as possible, and General French listened to the lad's recital in unfeigned amazement.

"And so you are the two who created such havoc in the ranks of the enemy," he exclaimed when Chester had concluded his account of their adventures. "I learned through some of my scouts that a wild engine had dealt a heavy blow to the Germans, but I had never thought that you two were aboard it."

Then it was that Hal told his commander of his encounter with young Dersi, and of what the latter had told him concerning General Tromp, of General Joffre's staff.

"What!" cried General French, springing to his feet. "Tromp a traitor!

Why, it is unbelievable. General Joffre has entire confidence in his ability and integrity."

"Nevertheless it is true, there can be no doubt of that," said Hal quietly. "Dersi told us with almost his dying breath, and he certainly was repentant at the end."

"Oh, I do not doubt your word," General French a.s.sured Hal, "but it seems impossible. Something must be done at once."

"Will you allow me to make a suggestion, sir?" asked Hal respectfully.

"By all means," was the general's reply.

"Then I would suggest that you send word of General Tromp's treachery to General Joffre by special messenger, and not trust to the field wireless, for in that way Tromp might learn that he was suspected and make his escape."