"Two green lights and a red, sir, over there, half a mile away," came the reply. "That's right. It's the 'Gertie' trying to find the landing place. Flight-sergeant, where are you?" "Here, sir," came the answer, as the aerodrome flight-sergeant, just roused by the alarm, rushed up, without putties or tunic on. "Light the usual flares at the landing-place, and give the Brigade colours as well." "Yes, sir." And the next instant he had disappeared into the darkness again to hurry up the air-mechanics and to light the flares. The "Gertie" had very nearly found her mark, having over-shot it but half a mile or so in the pitchy darkness, which was a very creditable performance. As soon as the flares were lighted, her engines, which had been shut off, were heard again, as she gradually came nearer and nearer, until, when right overhead, she began to descend slowly. "There she comes! This way, lads!" cried the stentorian voice of Snorty, whose piercing eyes were amongst the first to spot the looming mass overhead. "Steady, there, steady!" came the next order, as the ropes and drags were lowered, and the men made a scramble for them. And, in a very short space of time the baby-airship was made fast, and from the single gondola, in which five men were cooped, some one leapt out, who held in his hand a bundle of documents. "Captain Scott, I believe, sir," said the orderly officer stepping forward. "Yes. Are you Lieutenant Grenfell?" "Yes, sir." And with that the two men went off together to the private room of the orderly officer. The newcomer was the bearer of some important plans and sketches, to obtain which he had risked his life every hour of the day and night during the past three weeks. They were nothing less than detailed plans of the great German arsenal at Krupps', for which the Commanding Officer had been anxiously waiting. For some time previously, the C.O. had received from the War Office, through the General Headquarters in the field, a peremptory order, something like the following:-- _"To the Officer Commanding,_ _"--th Squadron, Royal Flying Corps._ "It is of vital importance that the enemy's supply of munitions should be hampered and restricted as far as possible, in view of the offensive to be undertaken shortly. As soon, therefore, as the necessary plans and papers reach you, you will detail one of your best flights, under your most capable Flight-Commander, to carry out the first raid on the enemy's main arsenal at Krupp'." This document, signed by one of the generals commanding in the field, had been in the hands of the Squadron-Commander for some days, and he had been eagerly awaiting the arrival of the promised plans and sketches. As soon, therefore, as the orderly officer received them, he sent Brat, the despatch-rider, with his motor cycle and side car to the C.O.'s quarters. And ten minutes later that distinguished person was leaving the officers' quarters on his way to the aerodrome.