Whilst these fresh dispositions and general retrogressions had been made on this front the Thirty-fourth Division to the south had also been compelled to rearrange its positions. It has already been described how, under cover of the 147th Brigade, they withdrew in absolute order across the Lys. April 11 saw such continued pressure, however on the right of the Twenty-fifth and the whole of the Thirty-fourth Divisions that it became clear early in the afternoon of April 11 that further retirement was imperative. This began at dusk, the three brigades retiring by the Armentières-Bailleul Road, while the 147th still acted as rearguard. They retired through the 74th and 88th Brigades near Bailleul Station, fighting back all the way and considerably harassed by the German guns. On the morning of the 12th the general line was Steam-mill-Bailleul Station-southern border of La Crêche to a point about 500 yards north-east of Pont d'Achelles on the Bailleul Road. Along this line the order of battle from the south was the 147th, 75th, 101st, 74th, 102nd, and 88th Brigades. Nieppe, which had been evacuated, was occupied by the enemy later in the day, and on the evening of April 12 the line was pushed a little farther back to De Seule. There was no fighting on the new line opposite {258} Messines on April 12, but the battle was, as has been shown, raging furiously elsewhere, and the situation in the south, where the enemy was making progress, must deeply affect that in the north. Had an aviator taken a swift flight from Hollebeke to Givenchy on this day, following the deep curve which had formed in the British line, his observations would have been roughly as follows: in the Hollebeke district he would have found no extreme pressure, and that the Ninth Division, reinforced by the 58th Brigade, was holding the line not far westward of their original position. From there onwards he would have skirted the new line of the Ninth Corps, as already indicated, and would have seen the remains of the Nineteenth Division covering the north of it, the Twenty-fifth Division, also in fragments, about Neuve Eglise, and the Thirty-fourth Division near Steenwerck. He would next observe with consternation or joy according to his colours, that there was a considerable gap before Bailleul. At the other side of this gap he would come upon elements of the Thirty-first and Twenty-ninth Divisions, hard-pressed and worried by the advance which the enemy had made through Merville on their right. He would catch a glimpse also of some thin lines of resistance, still farther south, which represented all that was left of the Fiftieth Division. Finally, he would see the Fifty-first and the Fifty-fifth on the extreme south, both of them standing firm in their positions. Looking eastwards he would see pouring across the Lys the legions of Prince Rupprecht of Bavaria, hurrying to improve their blow, while behind the British