The 6-pdr Wiard (pronounced WEE-ard) rifle was cast in puddled wrought iron (semi-steel) and was mounted in a special Wiard field carriage that was unique in its design. The rim base was spaced farther apart than any diameter of the tube, permitting unrestricted rotation on the trunnions without interference from the undercarriage. Wiard altered the shape of the carriage's cheeks, relocated the axle and provided a long elevating screw; this made firing at elevation of up to 35 degrees possible.Reportedly, three artillery batteries associated with Union Major General Daniel Sickles' "Excelsior Brigade" were armed with 6-pdr and 12-pdr Wiard guns, possibly as a result of a friendship between Wiard and Sickles. Two batteries of six 6-pdr guns each were ordered specifically for that brigade in 1861. None of Wiard's weapons were widely adopted, and few survive today.