"It's a general move, eh?" Philip asked his chum, meeting him as he crossed from his bivouac of the night before to fall in with his regiment. "Please note that I am appealing to you, Geoff, as a man who ought to know everything that's happening; if not, what's the good of a fellow being on the Head-quarters Staff. What's up?"

"I know as little as you do," came the laughing rejoinder; "but I can guess, and my guess is that we are on the way up the river to take Kurna. It's somewhere about there that the Rivers Tigris and Euphrates come together, and I suppose it's a point of some strategical importance."

"Strategical! Ahem!" coughed Philip. "Ain't we going it! From talking Turkish we're now getting to use quite military sort of language!"

It was just one of his little pleasantries, and, indeed, Geoff was the sort of young fellow who never resented being twitted, and, moreover, he was rather given to being facetious himself, especially when with Philip. However, he was too busy on this eventful morning to spend time in bantering, for indeed much was about to happen.

We have mentioned already that the head of the Persian Gulf is of no little importance to Great Britain, and that for many reasons, one of which, no doubt of somewhat recent origin, has to do with the supply of oil for our battleships—a supply which is piped from the oil-fields in Persia, under the control of Britain. The pipe-line itself passes down in the neighbourhood of Ahwaz, towards which place a portion of the Expeditionary Force was at that moment proceeding, with a view to seizing it and holding it against the enemy. But the safe possession and protection of that oil-line was not the only reason for sending an Expeditionary Force to Mesopotamia.

There were other, and perhaps somewhat complex reasons, which can only be broadly dealt with in this cover. International questions are involved, the discussion of which would take up an abundance of space, and might well prove not altogether interesting. But it becomes necessary at this stage to give some idea, even if it be only a meagre description, of other reasons which induced the British Government to dispatch a force to the valley of the Euphrates.

The Persian Gulf and the coast which borders it may be said to be the eastern end of the Turkish possessions, while Turkey in Asia is bounded to the north and east by the difficult country of Persia. Already we have sketched in the position of Russia and of the Caucasus frontier, and have stated that the coming of Turkey into this gigantic conflict on the side of Germany and Austria—the Central Powers—had a distinct and direct effect on the fighting in Europe, seeing that the Turks were able to dispose of some excellent troops, and were able to dispatch them promptly to the Caucasus area, where, fearing the invasion of southern Russia, the Tsar was forced to march and post an adequate army—an army which, but for the Turks, might have been merely a frontier guard, allowing of the bulk of the troops being dispatched to Poland, there to meet Germany and Austria. Thus the entry of Turkey into the war affected Great Britain and her allies, but yet cannot be said to have called for an expedition on our part to the eastern end of the Turkish Empire. Distances are huge in the country governed in name by the Sultan of Turkey, and in actual fact by the Young Turk party, who, let us explain, are themselves swayed, if not actually governed, by the emissaries of the Kaiser in Constantinople. From Constantinople itself to Bagdad, or to the Caucasus front, is roughly a thousand miles, and from Bagdad to the head of the Gulf of Persia is perhaps some five or six hundred more. But, as we have shown, a blow dealt at a distance may, in the war which is now raging, affect the course of that war at some far-off point—as the amassing of Turkish troops on the Caucasian frontier had already undoubtedly affected the fortunes of the Russians in Poland. Thus our Expeditionary Force sent to the valley of the Euphrates and of the Tigris might very well, though that point is at such a great distance from the Russo-Turkish frontier, affect the fortunes of the Turkish troops fighting the Russians in the Caucasian Mountains; for undoubtedly the enemy would need to send troops against us. But, and this is a matter of considerable importance, the valley of the Euphrates is notoriously unhealthy and is an extremely difficult country to negotiate. Practically roadless, and without a railway, it is not a country easy of invasion, and at the best no rapid advance was to be expected. Thus the force which Britain could afford to send to this somewhat out-of-the-way part of the world, though it might affect the Turks to some degree, could not be expected to make a very serious difference to them. It would seem, therefore, that there was another reason, and a better one, for our sending troops to Mesopotamia.

Indeed, a consideration of facts well known to the British Government makes it clear that fear for the safety of India had something to do with the matter. It was known, and had been known for a long time, that German emissaries had been exceedingly busy, not only in Turkey in Asia but also in Persia. Persia itself is inhabited by a decadent nation, unable to keep order, disturbed by bands of outlaws. The country lies, as a glance at the map shows, squeezed in between Russia, Afghanistan, and Turkey; and passage through it, though difficult, gives access to our possessions in India. There are not wanting signs that Germany would, if she could master her Turkish friends, quickly accomplish the subjection of Persia, and from thence make her blow against India. For recollect, though the seas give a clear passage to our Indian Dominions, there is a British fleet to be reckoned with, and the first day of the war saw that fleet paramount, sweeping the seas, making the invasion of our Eastern possessions on the part of Germany hopeless by the sea route. Thus, Germany had need to look for another way, and for long her thoughts had been at work, scheming and conspiring to obtain the assistance of Turks and Persians.

No doubt it was for this reason, amongst others, that an Expeditionary Force left India for Mesopotamia; for, with Russian troops able to invade Turkey from the north, and to keep a watchful eye on Persia, and with British troops advancing up the Tigris River to the very boundaries of that country, there was every prospect of being able to counter the moves of the Kaiser's agents, and to ruin their fortunes. Actual opposition from the subjects of the Shah of Persia was hardly to be expected or feared, for, if anything, the ruling powers in Persia were likely to be friendly; and then again the condition of the country has now for some considerable while been in a chaotic state, almost devoid of a standing army, and so feebly governed that anarchy and outlawry had at one period been rampant. Indeed, the unsettled condition of Persia, its contiguity to Russia, and the danger of outlaws invading that country, had led, some while before the outbreak of this huge war, to a penetration of the Shah's dominions by the soldiers of the Tsar, which had at once created international jealousies. No doubt Germany, scheming at that time, as she undoubtedly was, to obtain a hold over the Shah of Persia and over the country, was furiously jealous of the coming of the Russians, and as furiously antagonistic to British influence in southern Persia. It may be said that the three nations, and others who may have been interested, watched the position in Persia with no little misgiving; and, seeing that outlawry was rife, and that some means must be obtained for bringing peace to the inhabitants, an amicable agreement was arrived at, after a while, which resulted in a system of policing—the officers of the force employed being brought from Sweden.

Thus, at the moment when Russia was facing the Turkish armies along the Caucasus frontier, and when the British Expeditionary Force was marching up the Shatt-el-Arab towards Kurna, Persia, seemingly quiescent and under the nominal governorship of its Shah, was controlled in some considerable measure by a police force commanded by Swedish officers, and no doubt the integrity of those officers was not all that it should be. That an attempt would be made to tamper with them, to suborn their allegiance to the Shah, to bribe them from the carrying out of their duties, was nearly certain. Germans were already in the country—those peaceful penetrators sent by the ambitious Kaiser—and might be trusted to make the utmost of the opportunity. For see what an opportunity lay before them! Here was a police force controlled by officers of a nation which was not a party to the war now raging, officers whose goodwill might perhaps be obtained by the offer of the Kaiser's money. There was a police force there, too, ready organized, and practically no army raised from the people of Persia to oppose it. Even had the Shah any considerable number of soldiers to boast of, there were yet in the country scores of outlaws who could be bought with the same gold which purchased the allegiance of those Swedish officers. The moment was almost ripe to strike a blow for the country, to seize it while Russia and France and Britain were busy elsewhere, and to lay the foundation in Persia for the march through Constantinople of Turks and Germans, and for the campaign destined to strike a blow at India.