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HMS Terror was an Erebus-class monitor built for the Royal Navy during the First World War in Belfast. Completed in 1916, she was assigned to the Dover Patrol where her primary duties involved bombarding German targets on the coast of occupied Belgium, particularly at the ports of Zeebrugge and Ostend. In October 1917 Terror was hit by three torpedoes, taking severe damage to the bow, and had to be towed into Portsmouth for repair. In April 1918 she participated in the Zeebrugge raid and provided gunnery support for the Fifth Battle of Ypres in September of the same year.