Cumberland spent the rest of the war on convoy escort duties and patrolling for German commerce raiders.

The Monmouths were intended to protect British merchant shipping from fast cruisers like the French Guichen, Châteaurenault or the Dupleix class.

The engines produced a total of 22,000 indicated horsepower (16,000 kW) which was designed to give the ships a maximum speed of 23 knots (43 km/h; 26 mph).

[2] The Monmouth-class ships' main armament consisted of fourteen breech-loading (BL) 6-inch (152 mm) Mk VII guns.

[10] She was sent to West Africa after the beginning of the war in August and supported operations in the Cameroons where she captured 10 German merchantmen at Douala on 27 September.

She was assigned to the 5th Cruiser Squadron in January 1915 where she conducted patrols for German raiders and escorted convoys for the rest of the war.