Opening them, the boys could hardly suppress their jubilation. Stripped of their official verbiage, the letters informed the young men that each of them was made a corporal, Joe for valorous service in saving the lives of "three Americans entombed in a cave; Slim for heroism and presence of mind in saving and bringing back to the lines an American soldier," and Jerry "for coolness and courage, and for the information gathered behind the enemy's lines." CHAPTER XVI A TIGHT PLACE Major Jones was paying his compliments in a very brusque, business-like, but kindly way. Before him, standing at attention, Lieutenant Mackinson and Corporals Joe Harned, Jerry Macklin and Slim Goodwin were awaiting important orders. "The manner in which all of you have performed your duties in the past has won you the esteem and confidence of your commanding officers," Major Jones said. "Your striking services not only have led to promotion, but to another important trust, upon which much may depend. Through the mountains to the east of us a company of engineers is cutting a rough road. They work under great handicaps and frequently are harassed by enemy detachments. But they are making progress. "This road is being cut for the purpose of permitting the passage of a wireless tractor, of which you men are to be in charge. Through a part of that section an old telegraph line still remains, but it does not connect in a direction to meet our requirements. "Reports received this morning indicate that by night the engineers will have put the road through to a selected point where you will have the least difficulty in concealing your tractor and its aerials. From your position there you will keep constant vigil, for you will be able to inform us long in advance of any effort of the Boches to come through that way. "The road winds about the mountain side, and in some places is quite steep. But the ground is now hard and the motor will make the pull. Good-by, and good luck to you." An hour later, with Frank Hoskins, who was an experienced driver, at the wheel, they started for their destination in one of the big, high-powered trucks which not only carry a complete wireless equipment but also provide enough space for sleeping quarters for half a dozen men. As a matter of fact, these trucks are so designed that, if it is necessary, they can carry a crew of ten men, while by means of a special clutch and gear the engine is made to drive an alternator for generating the necessary electrical energy which, under the most adverse atmospheric conditions, will give a sending and receiving range of at least one hundred miles. In ideal weather the radius increases to as much as two hundred and fifty miles. A powerful mechanism which in its operation resembles the opening of a giant pair of shears, raises the mast and umbrella-shaped antenna, and the average time in getting the apparatus ready for service is only about eight minutes.