Question: Temes-class river monitor was a type of warship that was first used in what decade?
Sentence (from "USS Monitor"): "Monitor" is most famous for her central role in the Battle of Hampton Roads on 9 March 1862, where, under the command of Lieutenant John Worden, she fought the casemate ironclad  (built on the hull of the former steam frigate USS "Merrimack" ) to a standstill.
Relevant evidence: No