His blow had followed swiftly on that of Franchet d'Esperey, and four days after the Balkan campaign had opened, British forces began the battle which was to prove the most perfect operation of the war. Preparations had been in progress during the summer, and little had been done to modify the British line running a dozen or fifteen miles north of Jericho, Jerusalem, and Jaffa to the sea. A Turkish counter-attack on 13 July had even met with some initial success; but the Turks had been unable to maintain their strength, the Germans could not assist them, the Arabs were perpetually harassing them along the Hedjaz railway, and what reserves they had were sent on a wild goose chase for the recovery of Turkish dominion in Caucasia and Persia and along the shores of the Caspian. The pursuit was rendered attractive by Russian impotence and anarchy: Armenia was regained and subjected to a final and more extensive massacre than ever; Northern Persia was overrun, and even the long and adventurous arms which the British Empire stretched out in August from Mesopotamia and India to the southern and eastern shores of the Caspian failed to save Baku from the combined efforts of Turkish troops and Bolshevik treachery on 14 September. But Allenby, the luckiest of British generals, brought down these airy Turkish castles with a single blow. He had been largely reinforced from India, which mobilized during the war nearly a million men and bore the chief burden of the Palestine and Mesopotamian campaigns; he had got a magnificent force of cavalry, and with it the terrain and open fighting wherein to exhibit a model of that traditional strategy from which the glory on European battlefields had departed for ever.

On 19 September his infantry drove the Turks from a sixteen-mile line between Rafat and the sea back a dozen miles to the railway junction at Tul Keram, while his cavalry burst through to the right towards the gap south-east of Mount Carmel and the plain of Esdraelon. It was a rare ride: on the morrow they were forty miles north and north-east at El Afuleh, Nazareth, and Beisan; and then wheeling south-east they cut off the retreat of nearly the whole of the Turkish forces. On the 22nd Allenby reported that 25,000 prisoners and 200 guns had been taken and counted, and that the Seventh and Eighth Turkish armies had virtually ceased to exist. The Fourth was pursued across the Jordan, and mostly mopped up between its pursuers and the Arabs to the east. On the 25th we were round the Lake of Galilee, and the number of prisoners had risen to 45,000 and of captured guns to nearly 300. There was nothing left to stop our advance, which was joined by some French battalions, while the Arabs kept pace on the other side of the Jordan. On the 28th we effected a junction with them at Deraa, and Damascus fell on the 30th. On 6 October cavalry, advancing between Mts. Lebanon and Hermon, seized Zahleh and Rayak between Damascus and Beyrut, which the French occupied on the 7th, while the British took Sidon. On the 9th we were at Baalbek, on the 13th at Tripolis, and on the 15th at Homs. On the 26th Aleppo fell, and on the 28th we reached Muslimieh, that junction on the Baghdad railway on which longing eyes had been cast as the nodal point in the conflict of German and other ambitions in the East.

Allenby played the leading part in Turkey's destruction, partly because Marshall's attention in Mesopotamia had been distracted towards the Caspian. But in October he resumed his interrupted march up the Tigris: on the 25th his troops captured Kirkuk and forced the passage of the Lesser Zab; and on the 28th they took Kalat Shergat, and after a six days' battle forced the Turkish army on the Tigris to surrender. Turkey had taken a lot more beating than Bulgaria, but the end was the same. On 30 October an armistice was signed, which permitted the Allies to occupy the forts on the Dardanelles and Bosporus and make free use of the Straits. Marshall entered Mosul, and presently British ships commanded the Black Sea and British troops were holding a line across Caucasia to the Caspian and connecting with the chain of forces established between Krasnovodsk and India. An end was thus put to Germany's dreams of a Teutonic-Turco-Turanian avenue into the heart of Asia, but the search for an eastern front in Russia against the Central Empires was elusive. For the Bolsheviks, in spite of the murder of Count Mirbach the German ambassador at Moscow on 6 July, grew ever more friendly to the Prussians, and the Entente had to go to Vladivostock for a basis of operations, and rely largely upon the romantic achievements of the Czecho-Slovak prisoners who had enlisted in the Russian armies and refused to lay down their arms at the Peace of Brest-Litovsk. At first the Bolsheviks promised them a passage via Siberia to the Western front, but then, like Pharaoh hardened their hearts and refused to let the infant nation go. Thereupon the Czecho-Slovaks set up for themselves, seized the Siberian railway from the Bolsheviks, and after much hardship and fighting established contact with the motley Entente forces advancing from Vladivostock. With their assistance an anti-Bolshevik government, of which Admiral Koltchak afterwards made himself master, was set up in Siberia, while Entente forces, mostly British, were sent to Archangel and the Murmansk coast to prevent the Germans establishing their authority there as they had done in the Baltic provinces "liberated" by the Peace of Brest-Litovsk.

But this Eastern front, which as late as August was regarded in high but civilian quarters as indispensable to the Allied success, failed to pierce the protection which the Bolsheviks gave to Germany or to penetrate farther west than the Urals; and Germany had after all to be beaten by professional strategists on the Western front. There was little fault to be found with their progress, and while Bulgaria, Turkey, and Austria were collapsing in the East, the Germans were being steadily driven towards disaster on a widening field of battle in the West. Simultaneously with Pershing's destruction of the St. Mihiel salient the British were thrusting the Germans back to the Hindenburg lines between Cambrai and St. Quentin, and Mangin was pushing forward towards the forest of St. Gobain. The Germans attempted to stand at pehy, but on 18-19 September they were driven back with the loss of 11,750 prisoners and 100 guns; and from the 27th to the 30th was fought the first phase of the battle for Cambrai and St. Quentin, in which the British First, Third, and Fourth armies took 26,500 prisoners and 340 guns apart from the gains of the French. The object was to complete the breach of the Hindenburg lines on the strength of which public opinion in Germany was stayed; and it was a critical operation. The lines themselves were reinforced by the Canal du Nord protecting Cambrai and the Scheldt-St. Quentin canal between Cambrai and St. Quentin.

The southern sector in front of the Fourth Army was the more strongly fortified, and an intense bombardment began on the night of 26-27 September which continued till the 29th. This tended to divert attention from the First and Third armies, which on the 27th forced the Canal du Nord south of Moeuvres and then spread fanwise along the eastern bank. By the end of the day they were more than half-way from the Canal du Nord to Cambrai, and on the 28th the advance was continued across the Scheldt canal at Marcoing and broadened from Palluel on the north to Gouzeaucourt on the south. On the 29th the Fourth Army began its attack on the canal to the north of St. Quentin. It was well supported by several American divisions, and the great episode of the day was the capture of Bellenglise by troops who crossed the canal equipped with life-belts, mats, and rafts. East of Bellenglise, Lehaucourt and Magny were also stormed, and north of it Nauroy and Bellicourt. Meanwhile the Third Army captured Masnires and penetrated into the western outskirts of Cambrai while the Canadians threatened to outflank it on the north. On the 30th the Germans had to withdraw their centre at Villers Guislain and Gonnelieu, while the Fourth Army extended its gains southwards by the capture of Thorigny; and, thus menaced, the Germans had to abandon St. Quentin to the French on 1 October. On that day, too, New Zealanders and British troops took Crvecoeur and Rumilly south of Cambrai, and the Canadians Blcourt to the north of it. The Hindenburg line, apart from its tottering supports, had gone at the moment when Bulgaria was capitulating; and on the same 30 September Count Hertling and all his Secretaries of State resigned.

The British victory, while the critical movement on the Western front, was but one of the four operations which Foch had concerted with Haig in the middle of September. The other three were a Belgian attack at Ypres, an American advance on the Meuse, and a French offensive in close connexion with it in Champagne and the Argonne. The Belgian attack was an agreeable surprise, and nothing did more to illumine the change from 1917 than the contrast between its rapid success and the painful crawl of Gough's campaign. The cause was that which also accounted for the Germans' failure elsewhere; they had not the forces to sustain their vast and crumbling front, and they attempted to hold the line in Belgium with no more than five divisions. The attack began on 28 September on a twenty-three mile front, and in one day 50 per cent more ground was covered than had been gained in three months the year before. The whole of Houthulst forest, which then had hardly been touched, was taken at a stroke; and on the 29th Dixmude fell and the Belgians were across the Roulers-Menin road. As a consequence of this and of Haig's advance the Germans had to evacuate the rest of the Lys salient and draw back their front towards Lille and Douai. Armentires was recovered on 3 October, La Basse and the Aubers ridge were abandoned without a struggle, and the Germans surrendered the remaining section of the Drocourt-Quant line, withdrawing to the Douai, Haute Deule, and Sense canals which protected Lille and Douai.

The French and Americans had a sterner task in the Argonne and on the Meuse, for here was the pivot of the Germans' whole position in the conquered territory. A possible retirement to the Meuse had been contemplated in 1917, and in September 1918 the Germans would have been glad to surrender everything west of it in return for safety on that line; hence their withdrawals and feeble resistance in Flanders. But the Meuse from Verdun to Mezires was an indispensable flank for any German front in Belgium; it had now become more to the Germans than even that, for it was the only shield behind which their armies could escape disaster and get back to Germany at all. Whatever else might have to go, this flank must hold; if it gave, the Germans would have to capitulate or suffer the wholesale destruction of their forces. Hence the stubbornness of the defence the Americans encountered; the terrain gave it every advantage with which art could supplement nature; and a singular and serious breakdown of their commissariat added to the difficulties under which American troops fought with intrepid skill.

The attack was launched on 26 September. The American front ran for seventeen miles from Forges on the Meuse, eight miles north of Verdun, to the centre of the Argonne, whence the French extended it to Auberive on the Suippe. Pershing's First Army advanced an average depth of seven miles and captured Varennes, Montfaucon,--for long the Crown Prince's headquarters,--Nantillois, and Dannevoux. Gouraud's progress was less rapid but better sustained. His greatest advance was only three miles, but it extended along a wider front and developed during the following days, while the Americans were held up by defective organization. Somme-Py and Manre were taken on the 28th, while on Gouraud's left Berthelot began to move from Reims, and farther west Mangin pursued the Germans across the Aisne. Progress along the whole French front continued in October; Gouraud's right pressed on to a level with, and then in advance of, the American left towards Challerange and Grandpr; his centre advanced towards Machault, and on his left Berthelot took Loivre, Brimont, and forced the passages of the Suippe at Bertricourt and Bazancourt, and of the Aisne at Berry-au-Bac. The Moronvillers massif was thus outflanked, and by the middle of the month the Germans were evacuating the whole of their ground south of the Aisne. This retreat, coupled with the French advance east of St. Quentin, endangered the great apex of the German front in the St. Gobain forest, and by the 10th its abandonment was begun. On the 11th the Chemin des Dames was relinquished, on the 13th the French were in La Fre and Laon, and the Germans were retreating to the line of the Serre.

Nevertheless, the advance of the right wing of the Allied front had not quite come up to expectations. The prolonged maintenance of the German bastion in the Argonne and on the Meuse enabled their centre to withdraw more or less at its leisure and thus avoid the colossal Sedan with which it was threatened; and, the French centre having been cast for a part subsidiary to those of the two wings, the brunt of the fighting fell upon the British, whose advance was not so fatal as similar progress would have been on the other wing. They were greatly assisted by American divisions serving with the Third and Fourth armies, by the Belgians and French on their left, and by the French on their right; but the check to the American advance enabled the Germans--unfortunately for them, as it turned out--to transfer reinforcements from the Meuse to Cambrai and Valenciennes.