[6] Four Yarrow boilers fed steam at 250 pounds per square inch (1,700 kPa) to two sets of Brown-Curtis direct-drive steam turbine which, in turn, drove two propeller shafts, with a rated power of 24,500 shaft horsepower (18,300 kW),[5][7] and a design speed of 29 knots (54 km/h; 33 mph) at full load,[6] with a speed of 29.95 knots (55.47 km/h; 34.47 mph) reached during sea trials.[8] On the outbreak of the First World War this Flotilla became part of the Harwich Force, under the overall command of Commodore Reginald Tyrwhitt.Two German torpedo boats, SMS A2 and A6 attacked the trawlers in the Battle off Noordhinder Bank, sinking one (Columbia) before the four British destroyers arrived.[30][31] Fearing an attack by German surface vessels against shipping in The Downs, against the Belgian coast or against the Dover Barrage, where anti-submarine nets were guarded by lightly armed trawlers, Vice-Admiral Reginald Bacon, commander of the Dover Patrol, ordered four destroyers, including Laforey, to Dunkirk on 26 October.While Laforey's division sighted the gunfire of the engagement, they were too far off to intervene, with the German ships escaping with little damage.[37] On the night of 17–18 March 1917, Laforey was on patrol in the Dover Straits when the Germans launched another raid by torpedo boats.Laforey sighted an explosion and investigated, and on reaching a field of debris, started to search for survivors, signalling HMS Llewellyn to assist.The merchant ships arrived safely, but at around 16:30, after the destroyers had begun the return trip, a large explosion occurred amidships on Laforey.