Numbers 122. Return of captures and abstract of prisoners taken.

HDQRS. FIRST CORPS, FAIRFAX COURT-HOUSE, October 12, 1861.

Return of captured ordnance and ordnance stores turned in to the Ordnance Department, Army of the Potomac, up to August 16, 1861:

One 30-pounder Parrott gun, with 300 rounds of ammunition; 9 10-pounder Parrott guns, with 100 rounds of ammunition each; 3 6-pounder brass guns, with 100 rounds of ammunition each; 3 12-pounder brass howitzers, with 100 rounds of ammunition each; 2 12-pounder boat howitzers, with 100 rounds of ammunition each; 9 James rifled, with 100 rounds of ammunition each, field pieces; 37 caissons; 6 traveling forges; 4 battery wagons, splendidly equipped; 64 artillery horses, with harness; 500,000 rounds small-arm ammunition; 4,500 sets of accouterments, cartridge boxes, &c.; 4,000 muskets.

No accurate return of drums, swords, pistols, knapsacks, canteens, bridles, &c., can be obtained. One 6-pounder gun and one 12-pounder howitzer were found spiked, but they were easily withdrawn. One of the enemy's caissons exploded in the field in addition to those captured.

Hospital equipments turned in up to August 16, 1861: 5 medicine chests, partially filled; 6 cases surgical instruments; two sets of panniers, 7 ambulances.

Returns of litters, instruments, supplies, &c., are all very incomplete, so much having been appropriated by surgeons of regiments, &c., besides the loss from plundering by privates and citizens.

Quartermaster's stores turned in up to August 16, 1861: 870 axes, spades, and intrenching tools; 2 sets carpenters' and blacksmiths' tools; 12 sets harness; 23 extra traces for artillery; 7 platform and other scales; 1,650 camp cooking utensils; 2,700 camp mess utensils; 302 pairs pantaloons, drawers, and socks; 700 blankets; 22 tents and flies; 21 wagons, 33 horses, 25 trunks and carpet-bags; 1 coil of rope.

Incomplete returns of many miscellaneous articles, such as bed-ticks, buckets, coffee-mills, halters, picket-pins, saddles and bridles, ten barrels commissary stores, and a few handcuffs left from a large lot captured, but carried off by individuals as trophies.

Abstract of prisoners and wounded of enemy sent to Richmond and the hospitals at other places since July 21, 1861: Prisoners not wounded sent to Richmond, 871; prisoners wounded sent to hospitals, 550. Total, 1,421.

These prisoners represent themselves as belonging to 47 different volunteer regiments, 9 regiments of Regular Army, and the Marine Corps. Besides these regiments, in the reports and orders of the enemy are mentioned by name one regiment of volunteers and companies from two regiments of regulars in Hunter's division, six volunteer regiments in Miles' division, and Runyon's entire division of at least five regiments from New Jersey, from which we have neither prisoners nor wounded, giving as his entire force fifty-nine volunteer regiments and detached companies and battalions from marines and eleven regular regiments. From the most reliable data his volunteer regiments averaged 900 men each, making in all 63,000 men.

E. P. ALEXANDER,
Captain Engineers, General Staff.