Geographies of the war area.
Before entering into a review of the combined Anglo-Russian campaign a preliminary survey of the strategical geography of the war area will make the position more clear.
Constantinople once the world clearing-house.
Still the easiest route.
In ancient times the only practical way by road and ferry from Europe to Asia or Africa was by way of the Balkan valleys and across the Bosphorus or Dardanelles. Hence arose the importance of the ferryhouse—Constantinople. That city in those days was the center of the known world and the clearing-house for the merchandise of Asia, Africa, and Europe. From Scutari, on the opposite shore, the overland route meandered across Asia Minor to Aleppo in Syria. Here the sign-post to India pointed down the Euphrates Valley, by way of Bagdad, while that to Egypt and Arabia followed the Levant or eastern shore of the Mediterranean. Between each fork lay the Syrian desert. A glance at the map shows the reason why in those days this was the only practical route, as to-day it is the easiest. The wall of the Ural Mountains, the Caspian Sea, the Caucasian Mountains, and the Black Sea shut out direct communication from Europe to Asia, or vice versa, except by the Constantinople ferry or a sea voyage.
Another practical route.
The road for invasion of Egypt or India.
The Taurus range is the natural frontier of Egypt.
In Asia Minor progress was further barred by the watershed of the Euphrates and Tigris rivers to the south, and the Caucasian Mountains to the east. A practical way was found at the lower elevations of the Taurus and Amanus mountains—two parallel spurs which strike the sea at the Gulf of Alexandretta. This narrow neck of the bottle, as it were, is of enormous military importance alike to the Turks and to the British. Through it must pass any army of invasion by land from Europe or Asia Minor to Egypt or India; and, conversely, through it must pass any invading army from Mesopotamia into Asia Minor. If the British should conquer Mesopotamia and should intend to hold it—as they undoubtedly would—they will have no strategical frontiers until they secure the watershed of the Tigris and Euphrates rivers and the Taurus passage. If they secure the latter, Syria, Palestine, and Arabia will fall to them like apples off a tree. It would then be no longer necessary to defend the Suez Canal. The natural frontier of Egypt is the Taurus mountain range. Asia Minor is the real Turkey; the other portions of the empire—MMesopotamia, Syria, Palestine, Arabia, and Turkey in Europe—are only appendages. The eastern door into Asia Minor is Erzerum, and the southern door is the Taurus passage. Turkey can only part with these at the cost of her life. Russia has already captured Erzerum, and the British possess the Island of Cyprus, which commands the head of the Gulf of Alexandretta—twenty miles from the Taurus passage. That is, broadly, the situation.
Aleppo is the starting point of caravan routes.