Statistics for occurrence #1 of “South-western Pacific” in chapter 35 of Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume I.:

...unty, twenty-three miles distant. Ten miles hence, at 10 A. M., next morning, they were confronted by a Union force 1,500 strong, under Col. Franz Sigel, who had been dispatched from St. Louis by the South-western Pacific road, to Rolla, had marched thence to Springfield, and had pushed on to Mount Vernon, Lawrence County, hoping to prevent a junction between Jackson and some forces which his Brigadiers were hurrying ...
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