We are not directly concerned with the bigger strategy of this Spring campaign. Sir Douglas Haig made it clear that he regarded the capture of the Vimy Ridge as necessary in itself and important for the view which it would afford over the plains to Douai and beyond. When this object should be achieved he proposed to transfer his main offensive into Flanders. ‘The positions held by us in the Ypres salient since May, 1915, were far from satisfactory,’ he wrote. ‘They were completely overlooked by the enemy. Their defence involved a considerable strain on the troops occupying them, and ... our positions would be much improved by the capture of the Messines-Wytschaete Ridge, and of the high ground which extends thence north-eastwards for some seven miles.’ These plans were re-adjusted to some extent by arrangement with the French Command: ‘The British attack, under the revised scheme, was, in the first instance, to be preparatory to a more decisive operation to be undertaken a little later by the French Armies,’ and though, as the British Commander wrote, ‘my original plan for the preliminary operations on the Arras front fortunately fitted in well with what was required of me under the revised scheme,’ yet, in order to give full effect ‘to the new rôle allotted to me in this revised scheme, preparations for the attack in Flanders had to be restricted for the time being to what could be done by such troops and other labour as could not in any case be made available on the Arras front.[75]’ So much in this place for the plans. What were the troops entrusted with their execution? Looking at a larger map again, and assuming for a moment that a week’s fighting (April 9th to 16th) has already taken place, and that the British front has been advanced, as indicated, from the outskirts of Lens in the north to Croisilles in the south, we may now enumerate Sir Douglas Haig’s forces as they were distributed from north to south in order of battle on April 17th. Note that the First Army was commanded by General Sir H. S. Horne, the Third by General Sir E. H. H. Allenby, the Fourth by General Sir Henry Rawlinson and the Fifth by General Sir Hubert Gough: great Generals all, and tried Commanders. We give, first, the positions, so far as they can be located for certainty in the third line which resulted from a week’s fighting, and, next, in descending scale of military organization, the Army, the Corps, the Division, and the Regiments:— ORDER OF BATTLE, 17th April, 1917.