A tiny revelation
…shells reach the required altitude, and keep firing at that area, preferably with multiple guns, and thereby create a wall of flak for the bombers to fly through. And as for artillery barrages, they too are walls, walls of artillery fire. Because of the spatially linear nature of trench warfare, any bombardment of an opposing section of the front is going to be spread out along a line, and so the continuous pouring of shells along that line creat…