However, by the middle of 1915 most of the stragglers had been gathered in.

But there remained loose ends, and towards the close of last year somebody was very busy combining these ends into a net.

Funny cases cropped up of the leakage of vital information.

They began to be bad about October 1916, when the Hun submarines started on a special racket.

The enemy suddenly appeared possessed of a knowledge which we thought to be shared only by half a dozen officers.