Amphitrite-class monitor

The Amphitrite-class monitors were a class of four U.S. Navy monitors ordered in the aftermath of the Virginius affair with Spain in 1873. The four ships of the class included Amphitrite, Monadnock, Terror, and Miantonomoh. A fifth ship originally of the same design, Puritan, was later fitted with extra armor and designated as a unique class.

This keyword could refer to multiple things. Here are some suggestions: