We turn now to the northern mists of the Orkneys, where the comings and goings of the Grand Fleet were wrapped in mystery from the eyes of the world. In order to keep the fleet in stores—coal, oil, gear, and hundreds of other requisite items—small colliers and tramp steamers brought their cargoes northward to Scapa Flow. In order to avoid the North Sea submarines, these coal and store ships used the west-coast passage as much as possible. Now, for that reason, and also because German submarines were already proceeding in earnest, via the north-west of Scotland, to the south-west Irish coast, ever since the successful sinking of the _Lusitania_, it was sound strategy on our part to send a collier to operate off the north-western Scottish coast. That is to say, these looked the kinds of ships a suspecting U-boat officer would expect to meet in that particular locality. Under the direction of Admiral Sir Stanley Colville, a handful of these little ships was, during the summer of 1915, being fitted out for decoy work. One of these was the collier S.S. _Prince Charles_, a little vessel of only 373 tons. In peace-time she was commanded by her master, Mr. F. N. Maxwell, and manned by five deckhands, two engineers, and two firemen. These men all volunteered for what was known to be a hazardous job, and were accepted. In command was placed Lieutenant Mark Wardlaw, R.N., and with him went Lieutenant J. G. Spencer, R.N.R., and nine active-service ratings to man the guns and use the rifles. She carried the weakest of armament—only a 3-pounder and a 6-pounder, with rifles forward and aft. Having completed her fitting out with great secrecy, the _Prince Charles_ left Longhope in the evening of July 21 with orders to cruise on routes where submarines had recently been seen. Proceeding to the westward at her slow gait, she saw very few vessels until July 24. It was just 6.20 p.m. when, about ten miles W.N.W. of North Rona Island, she sighted a three-masted vessel with one funnel, apparently stopped. A quarter of an hour later she observed a submarine lying close to the steamer. Here was the steel fish _Prince Charles_ was hoping to bait.