Battery C was mustered into Federal service on August 25, 1861 under the command of Captain William B. Weeden. On August 31st, it traveled to Washington, where it trained daily at Camp Sprague and Camp Randolph. Here, Battery C was assigned to General Morell's brigade under Porter's division of the Army of the Potomac.

With the Army of the Potomac, Battery C fought in some of the fiercest battles of the war. Its losses in men and horses were severe.

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