"Good! You are Karl," he said at once, repeating his explanation of their presence. "Count von Rudolfstein is my friend, and if he were here his house would be at our disposal. I must fill my tank without delay and return yonder."
"It is terrible, Herr Officer. The whole ground seems to be burning!" said the old man, completely disarmed by the cleverness of the lad's impersonation. "How much petrol do you require?"
"Twenty gallons, if you have it. Let us lose no time. Here is your good frau who will look after my observer."
"And to think, Herr Officer," said the old man. "One of the new super-Zeppelins that was going to punish England for her treachery! Oh that I was a young man again, and I had an Englishman within reach of these arms! They are still strong enough to strangle him!"
Dennis let him ramble on, and followed him as he strode out of the hall to a coach-house that had been converted into a garage.
A very handsome car stood over the inspection pit, and at one end of the building was a great stack of petrol tins. Evidently the Count was a wealthy man, and evidently too there was not that shortage of petrol in Germany that some of the English papers had been exulting over of late.
"Wait a moment," said the old forester, as Dennis seized a couple of tins in each hand. "We can sling more of them than that on this pole, and carry it between us."
Dennis inwardly congratulated himself that the old forester had not only no suspicions, but was also a man of resource; and the pair were soon crossing the bridge on their way to the aeroplane, which was now distinctly visible in the growing light.
"Ah!" chuckled the old man, pointing to the distinguished mark painted in black on the Aviatik's side, "they gave my son the Iron Cross for bravery at a place they call Verdun, but I am sorry he did not win it for killing Englishmen."
"Well, you can tell me what he did do while you hand me the tins," said Dennis, climbing up and unscrewing the cap of the tank, and the gurgle of the liquid into the big receptacle was like music to his ears.