It seemed, then, that Russia had no very formidable task before her. Early in May seven army corps began to move towards that great river. They included 180 battalions of infantry, 200 squadrons of cavalry, and 800 guns--in all about 200,000 men. Their cannon were inferior to those of the Turks, but this seemed a small matter in view of the superior numbers which Russia seemed about to place in the field. The mobilisation of her huge army, however, went on slowly, and produced by no means the numbers that were officially reported. Our military attaché at the Russian headquarters, Colonel Wellesley, reported this fact to the British Government; and, on this being found out, incurred disagreeable slights from the Russian authorities[132].
Meanwhile Russia had secured the co-operation of Roumania by a convention signed on April 16, whereby the latter State granted a free passage through that Principality, and promised friendly treatment to the Muscovite troops. The Czar in return pledged himself to "maintain and defend the actual integrity of Roumania[133]." The sequel will show how this promise was fulfilled. For the present it seemed that the interests of the Principality were fully secured. Accordingly Prince Charles (elder brother of the Prince Leopold of Hohenzollern, whose candidature for the Crown of Spain made so much stir in 1870) took the further step of abrogating the suzerainty of the Sultan over Roumania (June 3).
Even before the declaration of independence Roumania had ventured on a few acts of war against Turkey; but the co-operation of her army, comprising 50,000 regulars and 70,000 National Guards, with that of Russia proved to be a knotty question. The Emperor Alexander II., on reaching the Russian headquarters at Plojeschti, to the north of Bukharest, expressed his wish to help the Roumanian army, but insisted that it must be placed under the commander-in-chief of the Russian forces, the Grand Duke Nicholas. To this Prince Charles demurred, and the Roumanian troops at first took no active part in the campaign. Undoubtedly their non-arrival served to mar the plans of the Russian Staff[134].
Delays multiplied from the outset. The Russians, not having naval superiority in the Black Sea which helped to gain them their speedy triumph in the campaign of 1828, could only strike through Roumania and across the Danube and the difficult passes of the middle Balkans. Further, as the Roumanian railways had but single lines, the movement of men and stores to the Danube was very slow. Numbers of the troops, after camping on its marshy banks (for the river was then in flood), fell ill of malarial fever; above all, the carelessness of the Russian Staff and the unblushing peculation of its subordinates and contractors clogged the wheels of the military machine. One result of it was seen in the bad bread supplied to the troops. A Roumanian officer, when dining with the Grand Duke Nicholas, ventured to compare the ration bread of the Russians with the far better bread supplied to his own men at cheaper rates. The Grand Duke looked at the two specimens and then--talked of something else[135]. Nothing could be done until the flood subsided and large bodies of troops were ready to threaten the Turkish line of defence at several points[136]. The Ottoman position by no means lacked elements of strength. The first of these was the Danube itself. The task of crossing a great river in front of an active foe is one of the most dangerous of all military operations. Any serious miscalculation of the strength, the position, or the mobility of the enemy's forces may lead to an irreparable disaster; and until the bridges used for the crossing are defended by têtes de pont the position of the column that has passed over is precarious.
The Danube is especially hard to cross, because its northern bank is for the most part marshy, and is dominated by the southern bank. The German strategist, von Moltke, who knew Turkey well, and had written the best history of the Russo-Turkish War of 1828, maintained that the passage of the Danube must cost the invaders upwards of 50,000 men. Thereafter, they would be threatened by the Quadrilateral of fortresses--Rustchuk, Shumla, Varna, and Silistria. Three of these were connected by railway, which enabled the Turks to send troops quickly from the port of Varna to any position between the mountain stronghold of Shumla and the riverine fortress, Rustchuk.
Even the non-military reader will see by a glance at the map that this Quadrilateral, if strongly held, practically barred the roads leading to the Balkans on their eastern side. It also endangered the march of an invading army through the middle of Bulgaria to the central passes of that chain. Moreover, there are in that part only two or three passes that can be attempted by an army with artillery. The fortress of Widdin, where Osman Pasha was known to have an army of about 40,000 seasoned troops, dominated the west of Bulgaria and the roads leading to the easier passes of the Balkans near Sofia.
These being the difficulties that confronted the invaders in Europe, it is not surprising that the first important battles took place in Asia. On the Armenian frontier the Russians, under Loris Melikoff, soon gained decided advantages, driving back the Turks with considerable losses on Kars and Erzeroum. The tide of war soon turned in that quarter, but, for the present, the Muscovite triumphs sent a thrill of fear through Turkey, and probably strengthened the determination of Abdul-Kerim, the Turkish commander-in-chief in Europe, to maintain a cautious defensive.
Much could be said in favour of a "Fabian" policy of delay. Large Turkish forces were in the western provinces warring against Montenegro, or watching Austria, Servia, and Greece. It is even said that Abdul-Kerim had not at first more than about 120,000 men in the whole of Bulgaria, inclusive of the army at Widdin. But obviously, if the invaders so far counted on his weakness as to thrust their columns across the Danube in front of forces that could be secretly and swiftly strengthened by drafts from the south and west, they would expose themselves