From: DICTIONARY OF AMERICAN NAVAL FIGHTING SHIPS, Vol. II, p. 305.

A Swedish word meaning "thunder(ing) mountain."

Dunderberg, an ironclad screw frigate of 16 guns, was built by W. H. Webb, New York, N.Y., and was launched on 2 March 1865. She was never commissioned, and in 1867, in accordance with the Navy's policy to reduce its number of vessels, was returne d to her builder. She was sold by Webb to the French in whose navy she rendered notable service under the name Rochambeau.