One of his brothers, Dan Hopkins who served in the same regiment was mortally wounded in the Battle of South Mountain on September 14, 1862.
He was mortally wounded at Crampton's Gap during the Battle of South Mountain.
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Lee performed well in the Maryland Campaign of 1862, covering the Confederate infantry's withdrawal from South Mountain, delaying the Union Army advance to Sharpsburg, Maryland, before the Battle of Antietam, and covering his army's recrossing of the Potomac River into Virginia.
In September 1862, Farnsworth led a cavalry brigade in the Army of the Potomac during the Maryland Campaign, sparring with Confederate cavalry under J.E.B. Stuart and Wade Hampton in a series of minor engagements near South Mountain and Middletown, Maryland.