The lieutenant saw it and nodded approvingly. Ahead a few hundred feet was a low building, which was reached by the track which led from the switch.
"The guards are stationed at that shed across the track, and sometimes they come over," said Felix.
"But is the building open?" asked the lieutenant.
"There are no doors; only open arches. The tanks can be loaded and unloaded from the tracks," was the answer.
They were carrying three vessels, such as are usually employed for transporting petrol in small quantities, and nearing the shed the lieutenant said: "Remain here and await my orders. I will go ahead and investigate."
With two of the receptacles in his hands he crouched as low as possible, and made his way along the track, but before reaching the structure he left the track, and approached the shed from the south side. He was gone for more than fifteen minutes, and when he returned with the receptacles filled he immediately seized the other, returning with it also filled in a few minutes.
"Now, take these to the cross road, and out of sight. I will be there in fifteen minutes," and saying this he quietly left them.
The boys and Felix carried the cans to the designated place with the greatest care, for the fluid was precious to them. No sooner had they hidden the receptacles when something like a flash of lightning illuminated everything about them, and this was followed by an explosion.
Felix gasped as he gazed in the direction of the sheds, for he divined the cause. The boys, too, were startled.
"I wonder if the lieutenant did that?" asked Ralph.