. . .tally, in the direction desired, always keeping as accurate a measure of the distance tunnelled as possible. When it came time to suspend operations for the night, boards that had been previously prepared, would be fitted in the well, two feet below the surface, and covered over with some of the earth that had been removed, always being careful to put the old dirt that had been preserved on top, thus giving the surface the same appearance as the rest of the ground; all would then be carefully swept over, and all traces of new or fresh earth removed. The bunk would then be replaced and everything resume the careless appearance of everyday life.

So cautiously would this work be carried on that officers sleeping only a few feet away would not be disturbed, and never suspect that anything unusual had been going on. Thus, night after night, would the work be prosecuted, the men spelling each other in digging and doing sentry duty, until, by careful measurement, it was. . . Read More