Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. HMS Terror was an Erebus-class monitor built for the Royal Navy in 1915-16 at the Harland and Wolff shipyard in Govan, Scotland. The Erebus-class monitors were of 7,200 long tons (7,300 t) displacement, 405 ft (123 m) long, with a maximum speed of 12 kn (14 mph; 22 km/h) produced by reciprocating engines with two shafts, and a crew of 223. The ship''s main armament consisted of two 15 in (380 mm) main guns in a single forward turret, This turret had been built as a spare for HMS Furious.