Toward the end of August, 1862, nine companies had been enrolled and mustered in Baltimore, and went into "Camp Harford", a spot now included within the limits of Druid Hill Park.
Call of duty hurried it to the field before it had received its tenth company, the men recruited for which were mustered into other regiments.
The Seventh Regiment was raised and originally commanded by Colonel Edwin H. Webster, of Harford County, a representative from Maryland in Congress.
Additional leadership was provided by Major William H. Dallam, a prominent and highly esteemed lawyer of Harford County.
They suffered heavy casualties during the Siege of Petersburg, having to repel six charges by counterattacking units of the 15th Georgia Volunteer Infantry.