At the same time, the 3^d foot jagers began the fight on the right bank, succeeding to establish a bridge-head South-East of kilometer 16. The enemy clung against it and the daily casualties were such that it was decided to reduce its development and manning. In 1917 few portions of trenches running along the right bank remained solely held and were the starting point of the raids carried on against the enemy’s organizations, right up to the end of the war. A few shelters, last witnesses of our occupation, are still standing and will be kept up for the future. The 1^{st} foot jagers alone had lost in that action 10 officers and five hundred and fifty men, killed or wounded. The plan was not given up, but tactics was changed. The ground which had been captured was hurriedly fitted up, while a platoon of a tunneling company was set at task on the bank of the Yser to resume the advance by sap-work. The mining was progressing satisfactorily when it was realized that on the German side a similar work was on, which, in less than a fortnights time reduced to few yards the distance separating the Belgian saphead from the enemy’s. On the 27^{th} of May 1915, during the relieve, and taking the advantage of a pitch dark night and protected by a violent bombardment, a group of Germans jumped in our trench placing a machine-gun section in it. The enfilading fire of those guns caused heavy casualties to the 9^{th} line regiment which delivered a counter-attack. After useless efforts, the only alternative left was to push actively forward the organization of the remaining portion of the trench so as to render it able to resist, notwithstanding the achievement of the previous object, it is to say the strengthening of the Yser salient at kilometer 16. From time to time, the enemy tried to attack the trench but each time was repulsed by spontaneous counter-strokes. The enormous casualties suffered, either by the bombardments or by the numerous raids, carried out by the enemy, against the trench, made it deserve the name of: “Death Trench”. (Boyau de la Mort.) In September 1915, the more urgent works of the Death Trench were nearly finished and could easely suffice to the defence of the left bank of the river at kilometer n^o 16. The attention of the engineers was then driven on to the construction of the “Cavalier”, work which was to complete the above mentioned defence, by securing it against all attempts of the enemy to cross the river. The characteristic features of the “Cavalier” comes from the working condition it had to be submitted to, it is to say, to combine the defence as to fit or better to match in the most perfect way to the one of the “Death trench” thus forming a center of the highest possible resistance.