Though Frederick’s method succeeded, it was once brought within an ace of failure. From the first he knew that the weak point of his system was his northern frontier.

He knew that a blow in force from the Baltic could at any time paralyse his power of striking right and left, and it was in dread of this from Russia that he began by pressing us so hard to provide him with a covering fleet in that sea.

Owing to our world-wide preoccupations we were never able to provide such a fleet, and the result was that at the end of 1761 the Russians were able to seize the port of Colberg, occupy the greater part of Pomerania, and winter there in preparation for the decisive campaign in the following spring. Frederick’s view of his danger is typified in the story that he now took to carrying a phial of poison in his pocket. Owing, however, to the sudden death of the Czarina in the winter the fatal campaign was never fought. Russia made peace and Prussia was saved.

So critical an episode in the early history of Prussia cannot be without an abiding influence in Berlin. Indeed, it is not too much to say that in a country where military thought tends to dominate naval plans, the main value of the German Fleet must be its ability to keep the command of the Baltic so far in dispute that hostile invasion across it is impossible.

If then it is considered necessary to adopt a more drastic war plan than that we are now pursuing, and to seek to revive the fatal stroke of 1761, it is for consideration whether we are able to break down the situation which the German fleet has set up. Are we, in short, in a position to occupy the Baltic in such strength as to enable an adequate Russian army to land in the spring on the coast of Pomerania within striking distance of Berlin or so as to threaten the German communications eastward?

The first and most obvious difficulty attending such an operation is that it would require the whole of our battle force, and we could not at the same time occupy the North Sea effectively. We should, therefore, lie open to the menace of a counterstroke which might at any time force us to withdraw from the Baltic; and the only means of preventing this—since the western exit of the Kiel Canal cannot be blocked—

would be to sow the North Sea with mines on such a scale that naval operations in it would become impossible.

The objections to such an expedient, both moral and practical, are, of course, very great. The chief moral objection is offence to neutrals. But it is to be observed that they are already suffering severely from the open-sea mining which the Germans inaugurated, and it is possible that, could they be persuaded that carrying the system of open-sea mining to its logical conclusion would expedite the end of the present intolerable conditions, they might be induced to adopt an attitude of acquiescence. The actual attitude of the northern neutral Powers looks at any rate as if they would be glad to acquiesce in any measure which promised them freedom from their increasing apprehension of Germany’s intentions. Sweden, at any rate, who would, after Holland, be the greatest sufferer, has recently been ominously reminded of the days when Napoleon forced her into war with us against her will.

In this connection it may also be observed that where one belligerent departs from the rules of civilised warfare, it is open to the other to take one of two courses. He may secure a moral advantage by refusing to follow a bad lead, or he may seek a physical advantage by forcing the enemy’s crime to its utmost consequences. By the half measures we have adopted hitherto in regard to open-sea mines, we are enjoying neither the one advantage nor the other.

On the general idea of breaking up the German war plan by operations in the Baltic, it may be recalled that it is not new to us. It was attempted—but a little too late—during Napoleon’s Friedland-Eylau campaign. It was again projected in 1854, when our operations in the Great War after Trafalgar, and particularly in the Peninsula, were still living memories. In that year we sent a Fleet into the Baltic with the idea of covering the landing of a French force within striking distance of Petrograd, which was to act in combination with the Prussian army; but as Prussia held back, the idea was never carried out. Still, the mere presence of our Fleet—giving colour to the menace—did avail to keep a very large proportion of the Russian strength away from the Crimea, and so materially hastened the successful conclusion of the war.