Summary

| override_editor Encyclopædia Britannica, Ninth Edition…

In 1857 he resigned and entered the service of a Western railway, becoming its president. At the outbreak of the civil war he was engaged by Ohio as major-general commanding her volunteers, and was soon given the same rank in the United States army by President Lincoln. It fell to M‘Clellan to cross into West Virginia and begin the campaign there, which he did during the early summer, the campaign ending with the surrender of the Confederate forces at Rich Mountain and the expulsion of the opposing armies from his department, on July 14, 1861.
Source: Wikisource

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