We have it upon the authority of Sir Douglas Haig that the great local retreat of the Germans had no very great effect in modifying the Allied plans. Those plans, so far as the British were concerned, were to make a combined assault from the north and from the south upon the Ancre salient, Gough attacking from the south and Allenby from the north. As the salient had now ceased to exist, the rôle of Gough was confined to following up the German retreat until he came to the new Hindenburg line, which was an obstacle of so formidable a character that it checked anything short of a very powerful attack. Allenby's part of the programme was still feasible, however, and resolved itself into an attack upon the high ground held by the Germans and their whole line down to the point where the new positions began. How Allenby carried out this task, and the great success which attended his efforts, will be described in the coming chapters.

Before passing to this and the other great battles which will make the year 1917 for ever memorable in our history, it would be well to briefly enumerate those world events which occurred during these three months and which directly or indirectly influenced the operations in France. The French line had remained stationary save for the forward movement already described. In Russia the lines had also remained firm, and there was no outward indication of the convulsions into which that unhappy country was about to be thrown by the revolution which broke out on March 12 of this year. From Italy also there was nothing momentous to report. The most cheering news which reached the Allies was from the British Eastern lines of battle, where both in the Sinai Peninsula to the east of Egypt, and in Mesopotamia, good progress was being made. The Sinai desert had been practically cleared of that enemy who had advanced so boastfully to the capture of Egypt, and the British lines were now upon the green terrain which faces Gaza upon the frontier of Palestine. The chief success, however, lay in Mesopotamia. A great soldier had apparently appeared in the person of General Maude, whose name may be recalled by the reader as the Commander of the 14th Brigade upon the Western front. Leaving his limited activities in the prosaic trenches of Flanders, he had suddenly reappeared, moving swiftly along the track of so many of the old conquerors, and leading his picturesque force of Britons and Indians against the ancient capital of Haroun-el-Raschid. In February he had avenged Townshend by recapturing Kut with more than 2000 prisoners. Following up his victory with great speed, he entered Bagdad upon March 11 at the heels of the defeated Turks, and chased them north along the line of the German railway, the constructors of which had never dreamed what strange stationmaster might instal himself at their terminus. The approach of a Russian force seemed to hold out hopes for further combined operations, but meanwhile the whole of southern Mesopotamia remained in the hands of the British, and no Turk was left within forty miles of the ancient capital.

The chief event in Great Britain was the successful flotation of the great war loan, which attained proportions never heard of before, and ended by bringing in the huge total of one thousand million pounds.

Beyond the usual skirmishes of light craft and isolated sinkings of warships by mine or submarine, there was nothing of importance in naval warfare, but an immense influence was brought to bear upon the course of the war by the German decision in February to declare a war zone round the allied countries, and to torpedo every merchant ship, whether neutral or hostile, which entered it. The measure was a counsel either of ignorance or of despair, for no one who knows the high spirit of the American people could imagine for a moment that they would permit their vessels to be destroyed and their fellow-citizens to be killed in such a manner. Within two days of the declaration of unlimited submarine warfare the President of the United States broke off diplomatic relations with Germany, an act which was the precursor of war, though this was not formally declared until April 5. Great as were the loss, discomfort, and privation caused to Great Britain, and in a less degree to the other Allies, the accession of the United States with its enormous reserves of men and money to the cause of Democracy was far more than a sufficient make-weight. As events progressed, and as it became evident that Russia, swinging from the extreme of autocracy to the extreme of individualism, had ceased for a long time to come to be a useful ally, it grew more and more clear that the help of America was likely to save the Western Powers, not indeed from defeat, but from that pernicious stalemate and inconclusive peace which could only be the precursor of other wars to follow. Apart from the vast material help, the mere thought that the great race which has inherited our speech and so many of our traditions was lined up with us upon the day of Armageddon was a joy and an inspiration to every Briton.

CHAPTER II
THE BATTLE OF ARRAS

April 9 to April 23, 1917

Vast preparations—Attack of Snow's Seventh Corps—The Ibex Trench—Attack of Haldane's Sixth Corps—Attack of Fergusson's Seventeenth Corps—A Scottish Front—The splendid Canadians—Capture of Monchy—Essex and Newfoundland—A glorious episode—The Chemical Works—Extension of the battle to the north—Desperate fight of the Australians at Bullecourt.

Whilst the German line was falling back to its new positions, and the Allies were eagerly following it across the ravished countryside until the increased resistance and the familiar lines of barbed wire warned them that the immediate retreat had come to an end, Sir Douglas Haig had managed, without relaxing his pursuit, to collect a strong striking force at the point of junction between the new German line and the old. The blow which he contemplated was no small local advance, but was a wide movement extending from the neighbourhood of Lens in the north to Arras in the south, a front of more than twelve miles. Upon this sector a tremendous concentration of artillery had been effected, and four corps were waiting the signal for the assault, the three southern ones forming Allenby's Third Army, while the fourth or northern one was the right-hand corps of Horne's First Army. The southern corps were the Seventh (Snow), which operated to the south of Arras, having Croisilles for its southern boundary; the Sixth (Haldane), which advanced due east from Arras with the Scarpe for its northern boundary; the Seventeenth (Fergusson), which had its right on the Scarpe and its left on Thelus, with its front facing the three spurs which form this end of the Vimy Ridge; and finally the Canadian Corps (Byng), which faced this long and sinister slope, the scene of so much bloodshed in the past. Each corps was marshalled with three divisions in front and one in reserve, so that there were roughly 120,000 men in the storming line with 40,000 advancing behind them. Maxse's Eighteenth Corps was in reserve in the rear of the Third Army, while M'Cracken's Thirteenth Corps was behind the First Army. The Germans had six divisions, the Eleventh Prussian, Fourteenth Bavarian, First Bavarian Reserve, and the Seventeenth, Eighteenth, and Seventy-ninth reserve in the line. Their guns also were numerous, as subsequent captures were to prove, but it is probable that an extension of the Hindenburg retreat was in contemplation, and that some of the heavy artillery was already on the move. A second strong line from Drocourt to Queant was known to exist, and its occupation would form a natural sequel to the retirement in the south.