This is the gun I was referring to.

"The Woodruff gun, sometimes referred to as a "steel two-pounder skirmish gun," is one of the lesser-known fieldpieces of the Civil War. These miniature cannon rendered valuable service to the Union in Mississippi and several other locales of the Western theater, yet few are aware that they existed.

Their inventor, James Woodruff, was born in New Haven, Connecticut, February 26, 1821, and learned the carriage maker's trade in Pittsfield, Massachusetts, during his teens. In October 1842, he moved to Quincy, Illinois, to work for an Eastern real estate firm with large holdings in that area, but eventually re-entered the carriage manufacturing trade as a partner in the firm of Hayes & Woodruff. Shortly after the outbreak of war this business was liquidated, and in September 1861 Woodruff began manufacturing knapsacks, haversacks, and ambulances for the Union forces. He was appointed assistant provost marshal for the Quincy Congressional District on October 30, 1862, and on May 7, 1863, was made provost marshal, only to resign the post in 1864.

Sometime early in 1861 Woodruff designed a small fieldpiece for use by cavalry and infantry, and on October 6, 1861, submitted the following proposal to Brigadier General James W. Ripley, Chief of Ordnance, U.S. Army:

I submit herewith a description of, and propositions for furnishing light Cannon, known in the West as the "Woodruff gun." They are manufactured from the best charcoal scrap iron, faggotted, brought to a welding heat, and forged, and thoroughly compacted under a heavy trip hammer, then turned, bored, and polished. Their length is 3 feet, the bore is 2-1/8 inches, which just allows the chambering of seven lead ounce balls in the canister, the canisters which have been generally used with them have contained 42 lead ounce balls. For Infantry use the guns are mounted on 2 wheels, with trail, the wheels 4 feet in height, with Iron axles, 2 ammunition chests resting on the axle, one on each side of the Gun, securely fixed, and easily detached, they balance well on the axle, and when the end of the trail is raised, and the Gun is drawn by 2 men they have but little weight to support. The carriage part is made light, but strong, and all the materials and workmanship are of the best quality. Each gun is thoroughly proved before it leaves the factory. The weight of each Gun is about 256 lbs. They are accurately sighted, and at repeated trials have proved themselves effective with round ball at 1-1/4 miles, and with canister their most effective range is about 700 yards.

For mounted service or Flying Artillery to be used with 2 horses the Guns are mounted precisely the same as for Infantry, and have in addition a limber, with everything ready to attach the horses, and with 2 ammunition chests upon the limber on which 2 men can ride, as can also 2 other men on the chests on the gun axle. Each gun will be furnished with 2 Sponges and rammers, 1 Sponge Bucket, 1 Grease Bucket, and 1 Felling Axe.

I can furnish the Guns at the rate of twenty per week completely finished and ready for the field, after reasonable notice. The price will be Two Hundred and thirty-five dollars each if mounted for infantry use-or Two Hundred and eighty-five dollars each if mounted with limber for attaching horses. Any number of the Guns can be rifled at an additional cost of Fifteen dollars each. My residence and Factories are at Quincy, on the Mississippi River, in the State of Illinois."
FC