The plan which was most popular in those days was to pen the submarines in their bases and so prevent their egress into the North Sea. Obviously the best way to handle the situation was to sink the whole German submarine fleet; that was apparently impossible, and the next best thing was to keep them in their home ports and prevent them from sailing the high seas. It was not only the man in the street who was advocating this programme. I had a long talk with several prominent Government officials, in which they asked me why this could not be done. "I can give you fourteen reasons why it is impossible," I answered. "We shall first have to capture the bases, and it would be simply suicidal to attempt it, and it would be playing directly into Germany's hands. Those bases are protected by powerful 15-, 11-, and 8-inch guns. These are secreted behind hills or located in pits on the seashore, where no approaching vessel can see them. Moreover, those guns have a range of 40,000 yards, but the guns on no ships have a range of more than 30,000 yards; they are stationary, whereas ours would be moving. For our ships to go up against such emplacements would be like putting a blind prize-fighter up against an antagonist who can see and who has arms twice as long as his enemy's. We can send as many ships as we wish on such an expedition, and they will all be destroyed. The German guns would probably get them on the first salvo, certainly on the second. There is nothing the Germans would so much like to have us try." Another idea suggested by a glance at the map was the construction of a barrage across the North Sea from the Orkneys to the coast of Norway. The distance did not seem so very great--on the map; in reality, it was two hundred and thirty miles and the water is from 360 to 960 feet in depth. If we cannot pen the rats up in their holes, said the newspaper strategist, certainly we can do the next best thing: we can pen them up in the North Sea. Then we can route all our shipping to points on the west coast of England, and the problem is solved. I discussed this proposition with British navy men and their answer was quite to the point. "If we haven't mines enough to build a successful barrage across the Straits of Dover, which is only twenty miles wide, how can we construct a barrage across the North Sea, which is 230?" A year afterward, as will be shown later, this plan came up in more practical form, but in 1917 the idea was not among the possibilities--there were not mines enough in the world to build such a barrage, nor had a mine then been invented that was suitable for the purpose.