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"Immediately, as if the uplifting of the smoke had been prearranged, the discovered troops burst into a rasping yell, and a hundred flames jetted toward the retreating band. A rolling gray cloud again interposed as the regiment doggedly replied. The youth had to depend again upon his misused ears, which were trembling and buzzing from the melee of musketry and yells."
I think simply what it says. The brush is on fire and the enemy is retreating.