The strategical problem which presented itself at the outbreak of hostilities was a comparatively simple one -- for Japan at any rate. The power of Russia in the Far East depended on the maintenance of two great arteries of communication with the heart of the Russian Empire.

One of these was the over-sea passage from the Black Sea or the Baltic through the Suez Canal and the East Indian Archipelago-a voyage occupying six weeks at least, and however feasible in time of peace, rendered particularly difficult and even precarious under war conditions owing to the possibility of interception and the absence of any intermediate coaling stations.

The other connecting link between Port Arthur and St. Petersburg was the Trans-Siberian Railway, that gigantic enterprise which, completed in 1899, brought the capital of Russia within 15 days' journey of its furthermost outpost in the Yellow Sea. From Moscow to Port Arthur is a distance of some 4,000 miles, but at twothirds of its length the railway is interrupted by the great inland sea known as Lake Baikal.

At this point transshipment across the lake had to take place, a circumstance that offered an insurmountable hindrance to rapid transit. In the building of the railway, too, soundness had been sacrificed to rapidity of construction; the line was only a single track one, with stations and sidings at intervals of about 25 miles; and even when the whole service was monopolized for military purposes the number of trains that could be passed over the railway in one day was a fixed and very limited quantity.

Even with this line open, therefore, the rate at which Russia could reinforce her troops in the Far East had to be determined by other circumstances than military urgency, and the number of her reinforcements also had to be governed by the capacity of the line to bring up not only men, but supplies ; for Manchuria itself does not provide the means of support for a large army.

The experience of the American Army in Cuba and of the British Army in South Africa proved what tremendous difficulties may be encountered in carrying supplies to a large force at a distance much less remote from its base than Russia's was. For years past Russia has sent out her troops and supplies to the Far East mainly by sea. For twelve months before the war broke out a constant stream of transports, colliers and supply ships had passed from the Black Sea to the Gulf of Pechili, and this stream was only interrupted on the outbreak of war-a significant admission of the incompleteness of the Russian preparations, as well as of the inadequacy of the Trans-Siberian Railway to supply her needs.

Port Arthur and Korea

It was evident, therefore, that Japan's first object was to shut off Port Arthur from the sea, and her next to cut the railway communication to the North. This done, the Russian fortress, however impregnable to assault, must ultimately fall to investment. From Port Arthur, which, as a glance at the map will show, lies at the very tip of Liao-tung Peninsula, the railway runs due north for six hundred miles through Niuchwang and Mukden to Harbin, where it joins the branch line to Vladivostock.

Though Russia has for several years been in occupation of this territory, her hold upon it is by no means secure. The population is distinctly unfriendly, and for the mere defence of the line thousands of troops are necessary. Indeed, it was this necessity that Russia urged as an excuse for her military occupation of Manchuria.

Within the triangle of which Harbin is the apex, of which the lines to Port Arthur and Vladivostock are sides, and of which the course of the Yalu River is the base, the sphere of immediate military operations practically had to be confined, as the icebound condition of the coast to the west of Port Arthur made a landing in force there impossible till the spring. The necessity of maintaining communications tied the Russian forces very largely to the railway lines. But for either belligerent the helpless kingdom of Korea, which lies south of a line drawn between Port Arthur and Vladivostock, for aggressive operations, afforded the most convenient line of advance. Through Korea Russia could menace Japan, and through Korea Japan could most easily march against Port Arthur.

Naturally, therefore, Russia's first care was to mass her available troops on the line of the Yalu, and concentrate reinforcements at Harbin ready to be moved to whatever point might prove the objective of the Japanese attack. But the command of the sea was the essential condition to attack by land by either combatant. With the Russian fleet masked or destroyed, Japan could choose as a landing-place for her armies any of the numerous ports on the western coast of Korea, and so approach in force the Yalu River, which divides Korea from Manchuria and the Liao-tung Peninsula.

With imperfect command of the sea, Japan would have a second resource. She could land her troops at Masampo, separated only by a hundred miles of sea from her own ports, or she could, at a push, land her forces on the east coast of Korea, at Yuen San or Gensan. But the former plan of operations would have entailed a long overland march before the objective was reached, and the latter the maintenance of communications over difficult and mountainous country. Evidently, then, immeasurable importance attached to the result of the first naval engagements, and to their influence in giving the command of the sea to the one or the other of the two belligerent Powers.