"It's the fortresses," Hartman said. "God pity those three regiments!"
At a crossing we noticed, in the direction of the stockyards, a gigantic pillar of smoke. At the next crossing several similar smoke pillars were rising skyward in the direction of the West Side. Over the city of the Mercenaries we saw a great captive war-balloon that burst even as we looked at it, and fell in flaming wreckage toward the earth. There was no clew to that tragedy of the air. We could not determine whether the balloon had been manned by comrades or enemies. A vague sound came to our ears, like the bubbling of a gigantic caldron a long way off, and Hartman said it was machine-guns and automatic rifles.
And still we walked in immediate quietude. Nothing was happening where we were. The police and the automobile patrols went by, and once half a dozen fire-engines, returning evidently from some conflagration. A question was called to the firemen by an officer in an automobile, and we heard one shout in reply: "No water! They've blown up the mains!"
"We've smashed the water supply," Hartman cried excitedly to me. "If we can do all this in a premature, isolated, abortive attempt, what can't we do in a concerted, ripened effort all over the land?"
The automobile containing the officer who had asked the question darted on. Suddenly there was a deafening roar. The machine, with its human freight, lifted
