Four camps of instruction were established; one at Easton, under command of Colonel William B. Mann, of Philadelphia; one at West Chester, under Captain Henry M. McIntire, of West Chester; one at Pittsburgh, under Colonel John W. McLean; and one at Camp Curtin, Harrisburg, under Colonel G. A. C. Seiler, of Harrisburg.
George A. McCall, a graduate of the West Point Military Academy, of the class of 1822, a distinguished soldier in the war with Mexico, was appointed a Major General to command the corps. General McCall immediately organized his staff by appointing Henry J. Biddle, Assistant Adjutant General, and Henry Sheets and Eldrige McConkey, Aids-de-Camp. Subsequently, Professor Henry Coppee was attached to the staff as Inspector General.
On June 22 two of the regiments were ordered to Cumberland, Md., and soon afterward rendered excellent service at New Creek and Piedmont, in West Virginia until ordered to the lower Potomac regions.
On July 22, the day after the disaster at Bull Run, a requisition was made on the State for its Reserve Corps, and as quickly as the means of transportation could be provided, eleven thousand of these troops, fully armed and equipped, were sent to the defenses of Washington, and a few days later the regiments were mustered into the United States service for three years, or during the war.
This was the beginning of the Pennsylvania Reserves, an organization, which, during the later years of the war, won fame on many battlefields, and many of whose members sleep beneath the sod in Southern States. Their skill was everywhere recognized, and no others were more renowned for bravery.
Reverend A. S. Williams who gave the historical address on the occasion of the dedication of the statue to Governor Curtin on the site of Camp Curtin, among other interesting facts said: “When General McDowell’s soldiers were defeated at Bull’s Run, the trained Pennsylvania Reserve Regiment from Camp Curtin, steadied the Government at Washington. When General Lee attempted to invade the North in 1862, Governor Curtin called for fifty thousand volunteers, and a strong reserve was maintained at Camp Curtin ready to march at a moment’s notice.
“During the early months of the war, on one occasion trucks were pushed on the tracks of the railroad to the east of the Camp and a Brigade of Soldiers stepped on them and was carried by way of Huntingdon over the Broad Top Railroad to Hopewell; from here they marched through Bedford to Cumberland, Md. For two months these soldiers protected this community from the harrassing enemy.
“In June 1863 when the people of the State became apprehensive lest Harrisburg and Philadelphia fall into the hands of General Lee, again the troops from Camp Curtin met the enemy but a few miles from Harrisburg along the Carlisle Pike.”
Camp Curtin was available and often used as an Army hospital.
Among the commanders at Camp Curtin besides those above mentioned were Colonel Thomas Welsh, of Lancaster; Colonel Charles J. Biddle, of Philadelphia; and Colonel James A. Beaver, afterwards General and later Governor of Pennsylvania.