"Whatever it was," said Philip, when he presently came up laughing at his mishap, "I don't believe it eats potatoes, and I will gather them up in the morning." As it was too dark for hunting, and the cartridges were in a safe place, Lieutenant Coleman and Corporal Bromley slung their carbines and followed Philip, who was the first to find the foot of the ladder. It was not so dark but that they made their way safely to the camp, and, weary with the labors of the day, they were soon fast asleep in their blankets, unmindful of the rain which beat on the "A" tent and on the patched roof of the cabin of the old man of the mountain. CHAPTER V THE CIPHER CODE On the morning of July 4 the sun rose in a cloudless sky above the mountains, and the atmosphere was so clear that the most remote objects were unusually distinct. The conditions were so favorable for signaling that, after a hurried breakfast, the three soldiers hastened to the point on the ridge which they had selected for a station. Corporal Bromley took position with a red flag having a large white square in the center, and this he waved slowly from right to left, while Lieutenant Coleman adjusted his spy-glass, resting it upon a crotched limb which he had driven into the ground; and at his left Philip sat with a note-book and pencil in hand, ready to take down the letters as Lieutenant Coleman called them off. There are but three motions used in signaling. When the flag from an upright position is dipped to the right, it signifies 1; to the left, 2; and forward, 3. The last motion is used only to indicate that the end of the word is reached. Twenty-six combinations of the figures 1 and 2 stand for the letters of the alphabet. [Illustration: "CORPORAL BROMLEY TOOK POSITION WITH A RED FLAG HAVING A LARGE WHITE SQUARE IN THE CENTER."] It is not an easy task to learn to send messages by these combinations of the figures 1 and 2, and it is harder still to read the flags miles away through the telescope. The three soldiers had had much practice, however, and could read the funny wigwag motions like print. If any two boys care to learn the code, they can telegraph to each other from hill to hill, or from farm to farm, as well as George and Philip. You will see that the vowels and the letters most used are made with the fewest motions--as, one dip of the flag to the left (2) for I, and one to the right (1) for T. Z is four motions to the right (1111); and here is the alphabet as used in the signal-service: