One day, while the great fight on the Somme was in progress, and the Allies, by their great pressure were winning village after village from the enemy, there came a mysterious message to the Command Headquarters of the ---- Division, stating that the enemy had finished the construction of three huge Zeppelin sheds not far from Brussels. Also that the same number of Zeppelins had just arrived from Friedricshaven to take possession of the sheds, evidently preparatory to a raid upon Paris or London. The wires and despatch-riders were busy that day between the Command Headquarters and the Aerodrome. Plans were drawn up to destroy at an early date both the airships and the sheds. After some consideration, it was decided that "B" Flight should have the honour of carrying out the raid, and accordingly Dastral and Jock went to work at once with their maps and charts to evolve a thoroughly sound plan of campaign. Several days later, towards evening, another coded message from the same secret service agent behind the lines came to hand by carrier pigeon, which when decoded ran something as follows: "Two Zeppelins just left Brussels' sheds, travelling west-nor'-west!" "Send Flight-Commander Dastral to me at once," said the Squadron-Commander, immediately the message was read to him. As soon as Dastral appeared the O.C., who had been pacing about his little room, turned abruptly upon the pilot, and said, "See this, Dastral?" "Yes, sir," replied the youth, scanning the brief message, which told him so much. "You know what it means?" "It evidently means that a raid on London is imminent, and is being carried out to-night, I fancy, sir." "Exactly!" snapped the O.C., who at such times became easily fractious and irritated. At this moment the telephone in the C.O.'s office suddenly burst out, "Ting-a-ling-ling!" "Yes, who's there?" asked the Major sharply. "Advanced Headquarters, Fourth Army. Are you the R.F.C.?" "Yes--Squadron-Commander speaking from No. 10 Aerodrome." "Right. News is just to hand by field telephone that three Zeppelins have passed overhead making for the Channel. We have wired the coast stations and the R N.A.S. to look after them, and if possible to bring them down. There is evidently a raid in progress. What do you think you can do in the matter?" asked the officer at the other end. "Hold on just a few seconds, sir!" replied the Major. Then, turning round to Dastral, he repeated the conversation briefly, and said, "What do you suggest?" "Just this, sir," replied the pilot. "Our plan to destroy the sheds is well forward, and we hoped to carry it out in three or four days. We know exactly where the place is----" "Yes, yes, go on. The staff officer is waiting at the other end of the line," blurted out the C.O.