HNoMS Mjølner was the fourth of five ships of the John Ericsson-class monitors built for the Royal Swedish Navy and the Royal Norwegian Navy in the mid-1860s.
The Casco-class monitor was a unique class of light draft monitor built on behalf of the United States Navy for the Mississippi theatre during the American Civil War. The largest and most ambitious ironclad program of the war, the project was dogged by delays caused by bureaucratic meddling. Twenty ships of the class were eventually built at great expense, but proved so unseaworthy when trialed that they were quickly sidelined, causing a public scandal
USS Sangamon was a Passaic-class ironclad monitor, 1862. Renamed Jason, being fitted out at New York Naval-Yard in 1898 during the Spanish American War.
Imperial Russian Navy Monitors.