During World War I a number of heavily armed, shallow draught vesels were built or aquired for the British Navy. Known as monitors, after a similar clas of vesel introduces by the Union Navy in the American Civil War, they were intended principally for long range bombardment of the coast of Belgium. The 'Humber' was one of three monitors which were under construction by Vickers and which taken over by the British Navy. They were 265 ft long, with a displacement of 1260 tons, armed with two 6-inch guns mounted in an armoured turret, with two 4.7-inch guns aft. The 'Humber' also served in the Dardanelles and the Gulf of Aqaba.
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