The “Cavalier” in itself presents two different and parallel lines, the first one on the level with the ground, to serve the purpose of round way and communication line, the second, above level thus dominating the whole region. The latter trench is the firing one, the overlooking position of which permitting to carry out enfilading and plunging fires upon the two banks of the river Yser as well as in the Death Trench itself, and on the enemy’s organization round kilometer n^o 16. The dead angles of that position were under machine-gun fire and later, automatic rifles were placed at the entrance of the Death Trench, and also in the one connecting it with the “Cavalier”. The building up of the “Cavalier” was long and cost to our sappers and infantrymen many a toilsome days and many a casualties. Seeing those provoking works, the German indeed did not remain inactive, they frequently ruined our works with their artillery and minenwerfers, inflicting to our troops awful losses. The close of 1915 marked the end of the grounding of the accessory defences. The emplacements for trench mortars, machine-guns pits were rising little by little, the dug-out for the officer in Command of the “Cavalier” sector, was gradually coming to shape, and the shelters were rising from out the soil. It was then decided to reduce the occupation of the “Death Trench”. On October 11^{th} 1915, the bank of the Yser was blown up by a mine at about 275 meters in front of kilometer 16, thus opening a gap 6 or 8 meters in length, which connected the Yser to the flooded area. The Northern portion of the trench was filled up and then abandoned. Three bombing teams, garrisoned by day time the thus shortened line. Our men had become first class bomb throwers and feeling themselves well shouldered by the Van Deuren mortars (Belgian Stokes Guns) were full of confidence and never feared their opponents. In 1916 the organization of the “Cavalier” completes itself and becomes a real redoubt. The two flights of the work is provided with offensive and defensive weapons, as well as with liaison material of the most diverse nature. Concrete shelters for the men have taken the place of those built with logs, which so often were bombed to ruins by the enemy. A post of visual signalling was placed so as to maintain a constant contact with the commander of the sector. May 1916 was to be a tragic month for the kilometer 16 sector. From up the 2^{nd} on to the 22^{nd}, the German switched on the “Death Trench” a fire of the most terrific power, and hurling troops forward they managed to get a foot-hold in our position, but nothing daunted, a counter-attack winged them at once back, by dint of grenades fights and sharp hand to hand struggles.... The enemy fled, he had not even had time to take his dead and wounded back with him.