Krupp A.G., produced a 9 cm (6-Pfünder-Feldkanone C/61) rifled breechloader of cast steel with a "piston" breech-lock designed by Martin von Wahrendorff, which gave such good results that Prussia adopted steel for making army guns, which made Prussia the first country to do so.

The inventor, American engineer Lewis Wells Broadwell (who worked as a sales agent for the Gatling Gun Company in Europe[6]), was not able to enforce his patents in Prussia or get any money from Krupp[7] (which was not unusual for Germany at the time, then-notorious for foreign patent violation[8]).

[9] Breech closure was achieved by a steel wedge that slid transversely on a short groove at the rear part of the gun.

Krupp also copied the built-up gun invented by John Ericsson and patented by Blakely and Armstrong to manufacture larger artillery pieces.

the Honduran Navy has maintained one Krupp cannon, which is the first of its kind made by the company and still in working order, at the Amapala Naval Base on the Pacific coast.