* * * * * The general drummed on the table. There were four red flashes glowing at different points of the board--four points where American tanks or groups of tanks were locked in conflict with the enemy. Somewhere off in the enveloping fog that made all the world a gray chaos, lumbering, crawling monsters rammed and battered at each other at infinitely short range. They fought blindly, their guns swinging menacingly and belching lurid flames into the semi-darkness, while from all about them dropped the liquids that meant death to any man who breathed their vapor. Those gases penetrated any gas-mask, and would even strike through the sag-pastes that had made the vesicatory gases of 1918 futile. With tanks by thousands hidden in the fog, four small combats were kept up, four only. Battles fought with tanks as the main arm are necessarily battles of movement, more nearly akin to cavalry battles than any other unless it be fleet actions. When the main bodies come into contact, the issue is decided quickly. There can be no long drawn-out stalemates such as infantry trenches produced in years past. The fighting that had taken place so far, both under the fog and aloft in the air, was outpost skirmishing only. When the main body of the enemy came into action it would be like a whirlwind, and the battle would be won or lost in a matter of minutes only. The general paid no attention to those four conflicts, or their possible meaning. "I want to hear from those two strayed infantrymen," he said quietly, "I must base my orders on what they report. The whole battle, I believe, hinges on what they have to say." He fell silent, watching the board without the tense preoccupation he had shown before. He knew the moves he had to make in any of three eventualities. He watched the board to make sure he would not have to make those moves before he was ready. His whole air was that of waiting: the commander-in-chief of the army of the United States, waiting to hear what he would be told by two strayed infantrymen, lost in the fog that covered a battlefield. * * * * * The fog was neither more dense nor any lighter where Corporal Wallis paused to roll his pre-war cigarette. The tobacco came from the gassed machine-gunner in the pill-box a few yards off. Sergeant Coffee, three yards distant, was a blurred figure. Corporal Wallis put his cigarette into his mouth, struck his match, and puffed delicately. "Ah!" said Corporal Wallis, and cheered considerably. He thought he saw Sergeant Coffee moving toward him and ungenerously hid his cigarette's glow.