The Battle of Arras may be considered as having been in truth a one-day battle in the same sense as the succeeding Battle of Messines, for in each case the attack was delivered in order to gain a definite objective, which was the ridge from which observation could be obtained. The extreme limit of advance had not, however, been reached either in the south or in the north, and so in both these areas hard fighting continued, due partly to the efforts of the British to enlarge their gains and partly to the rally of the Germans and their attempts at counter-attack. There was no concentration of troops or guns, however, upon the side of the British, and no attempt at any considerable advance. We shall first follow these operations in the south where they centred chiefly round the village of Monchy and Wancourt in the areas of the Sixth and Seventh Corps. These we shall weave into a connected narrative, after which we shall return to the Vimy region and trace the movements which led to hard fighting in that quarter. In the Seventh Corps to the south the Fifty-sixth Division of London Territorials had, as already described, enlarged the area which it had taken the day before in the Neuville Vitasse sector. The general curve of the line was such that it was not possible for the units of the Seventh Corps to get forward until the Sixth Corps to the north had won some ground, but upon the afternoon of the 12th a very fine advance was made, by which the 169th Brigade stormed Heninel. The Cojeul River was crossed by the {45} Fourteenth Light Division, and the heights upon the eastern bank were occupied. The 41st Brigade of this unit had now come into the line. The first attempt upon the heights failed with heavy losses. Next morning it was found that Hill 90 had been evacuated, and they were able to advance and seize Wancourt. This brought the left flank of the Seventh Corps up to the right flank of the Sixth Corps, and ensured close co-operation in those operations to the north which will presently be more fully described. This storming of the German position in this section was the more important as the troops were faced by the new Hindenburg Line. It was well known that an alternative line from Drocourt to Queant existed some miles to the eastward, but none the less the fall of the front section at a period when much of its wire was still intact proved to the Germans how impossible it was to hold off British troops by mere passive obstacles. The tanks were of great assistance to the assailants in this difficult operation. Upon April 13 and 14 the Twenty-first Division, with the aid of the 19th Brigade from the Thirty-third Division, carried forward the line to the high ground about 1000 yards east of the stream at Henin, astride of that portion of the Hindenburg Line. Here all further attempts to advance were stopped by fresh German troops, until the operations were renewed upon April 23. This advance of the Twenty-first Division