THE MOLE AT ZEEBRUGGE. _The inner side of the Mole at Zeebrugge, showing the part of the structure which was a viaduct carried on steel piles. The two heavy concrete piers were erected by the Germans to make the Mole again usable after the destruction caused by the exploded submarine._] It was, of course, against the open part of the structure, the steel viaduct, that Lieutenant Sandford steered his old submarine, full of explosives, with the object of blowing up the viaduct, and so preventing any help from the landward side getting to the men who were resisting our landing farther on. The viaduct is said to have been covered with soldiers watching the approach of C 3, and unsuspecting their fate. The boat was rammed into the structure, the Lieutenant and his crew got away safely, the fuse did its duty, the viaduct disappeared with everyone on it, and communication with the land was cut off. Plate 22 shows the viaduct, seen from the bend of the mole on the inner side, looking shorewards. The two concrete blocks supporting the landward end of the viaduct were, of course, built by the Germans after the attack--they show exactly the place where C 3 did its work. Plate 23 was taken from the outer side of the mole, and shows the present temporary viaduct on its concrete piers, and in deep water beside it a flagstaff carrying a white ensign which has been placed on the spot, very charmingly, by the Belgians, as a memorial of the pluck of the men who, under that flag, carried out the great exploit. IV.--THE LYS SALIENT (PLATES 24 TO 34.) The region between the Ypres Salient and the La Bassée Canal, extending from the high ground by Wytschaete and Messines to Kemmel and then south-westwards by Bailleul and Meteren to Merville, and finally sharply eastwards to Festubert and Givenchy, forms the ground which the German advance in April, 1918, made into the "Lys Salient," which was to have opened the way for them to the Channel ports, and to have cut the Allied Armies in two.