everything—guns and howitzers, shrapnel and high explosive, carriages, railway-mounts, tractors, trucks, limbers, caissons, even the harness on the horses—is ordnance. [Illustration: A 16-INCH HOWITZER. Huge howitzers, streaked like zebras and spotted like giraffes, point their ugly snouts toward the sky.] [Illustration: A 16-INCH HOWITZER ON A RAILWAY MOUNT. Camouflaged monsters on railway mounts which can drop a ton of explosives on a given target twenty miles away.] From out of the smoke, so close behind the rolling barrage that they seem to be moving amid the bursting shell, a long line of tanks—elephantine monsters of the Mark VIII type and little, agile, humpbacked whippets—waddling forward across the welter of No Man’s Land, wading through ooze and slime, clambering over heaps of débris, crushing wire entanglements as easily as though they were made of string, rearing themselves against the walls of concrete pill-boxes and then crashing down upon them, straddling in their stride the yawning chasms of the German trenches, but always pushing forward, like terrible and ruthless prehistoric monsters, one-pounders and machine-guns spurting death from the loopholes in their armored flanks. Tanks and tank-guns are ordnance, of course. The barrage abruptly lifts, and the eager infantry, pouring out of the trenches, sweeps forward with a roar. Out in front, forming a thin fringe to the leading wave of the assault, are the autoriflemen, playing streams of lead on the enemy trenches from their Brownings and Chauchats as a street-cleaner plays a stream of water upon the asphalt from his hose. As the barrage lifts, the Germans, emerging from the dugouts where they have taken shelter, man their parapets, but volleys of hand-grenades drive them back again. Through the wire demolished by the tanks and into the shell-shattered trenches swarm the cheering Yanks. Parties of “moppers-up” hasten from dugout to dugout, calling upon the occupants to come out and surrender, and when they do not comply, tossing hand or gas grenades into the entrances or wrecking the dugouts with mobile charges. The captured positions are quickly organized. Machine-guns and trench-mortars are brought up and placed in position. Carts and voiturettes, ammunition-laden, some drawn by mules, others by hand, come forward at the double. An enemy machine-gun nest is located and promptly demolished by a pair of Stokes mortars, which send their bombs somersaulting through the air, as a juggler tosses bottles, in an unending stream. Then the enemy launches a counter-attack, the gray-clad hordes advancing doggedly while the rifle-fire crackles along the trenches and the machine-guns go into action with a clatter which sounds like a boy drawing a stick along the palings of a picket fence. Rifle-grenades and shell from the little 37-mm. infantry cannon burst amid the advancing Germans, gaps appearing here and there amid their close-locked ranks as patches appear in a moth-eaten fur when