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George B. McClellan became a Union general in 1861. For a time he headed the Army of the Potomac and was briefly the general in chief until March of 1862 when Lincoln relieved him of that post. In August of 1862, Lincoln reinstated him and McClellan helped the Union immensely at the Battle of Antietam. Later that year in November of 1862, Lincoln again removed him from active duty. For all practical purposes he was no longer a member of the Union military when he ran for president against Lincoln in 1864.

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11y ago

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