The bombardment of Hartlepool in December 1916 by the German High Seas Fleet killing 86 civilians and injuring 424 was a turning point for coastal defence. It prompted the development of a wider coastal defence plan, and construction of a battery at Blyth commenced in August 1916 by the Durham Fortress Engineers RE. The new battery's prime purpose was to prevent enemy landings and engage motor torpedo boats, but by the time of its completion in February 1918 it was also intended to protect the submarine depot ship Titania at Blyth. During World War I, the battery housed two six inch Quick Firing guns and two search lights. The guns were manned by four officers and 75 men of the Tynemouth Royal Garrison Artillery. Officially known as Blyth Battery, the battery was also known as Coulson Battery after the RE Officer responsible for its construction, and also as Link House Battery.



In 1925 Blyth Battery became incorporated into the development of the South Beach amenities when two of the buildings were converted into public toilets. In February 1940, the battery was re-excavated and by 14th March it was ready and mounted with two six-inch B.L mk.7 guns. Initially called Seaton Battery, it was renamed Blyth Battery in June 1940. The battery was now manned by A Battery, 510 Coast Regiment R.A (TA) with five officers and 110 men. The regiment was an independent Fire Command and commanded Berwick, Amble, Druridge, Gloucester and Blyth Batteries. By April 1944 Blyth Battery was manned by the Home Guard and in late November 1944 was placed in care and maintenance.