Mobilisation In February 1939 the existing AA defences came under the control of a new
Anti-Aircraft Command. In June, as the international situation worsened, a partial mobilisation of the TA was begun in a process known as 'couverture', whereby each AA unit did a month's tour of duty in rotation to man selected AA gun and S/L positions. On 24 August, ahead of the declaration of war, AA Command was fully mobilised at its war stations. The 5th Battalion was deployed to support the Newcastle Gun Defence Area (GDA). The S/L layouts had been planned on a spacing of , but due to equipment shortages this was extended to . On 1 August 1940 all of the RE and infantry AA units were brought under command of the
Royal Artillery. Therefore, the battalion was renamed as the
53rd (Royal Northumberland Fusiliers) Searchlight Regiment, Royal Artillery with its companies (408, 409, and 410) becoming batteries. During this re-organisation,
Anti-Aircraft Command (AA Command) was also being overhauled, with many new brigades and divisions being formed, one of them being the
57th Light Anti-Aircraft Brigade formed on 25 August 1939 which initially only controlled the Light AA (LAA) units of the division.
Newcastle Blitz During the
Luftwaffe night-bombing campaign against British cities in the winter of 1940–41 (
The Blitz) 30 AA Bde controlled the AA guns in the Newcastle GDA, while 57 AA Bde controlled the S/L layout, including 53rd S/L Regiment. The regiment served through the
Newcastle Blitz. In November 1940 AA Command changed its S/L layouts to clusters of three lights to improve illumination, but this meant that the clusters had to be spaced apart. The cluster system was an attempt to improve the chances of picking up enemy bombers and keeping them illuminated for engagement by AA guns or
Royal Air Force (RAF)
Night fighters. Eventually, one light in each cluster was to be equipped with
Searchlight Control radar (SLC) and act as 'master light', but the radar equipment was still in short supply. On 17 April 1941, 565 S/L Bty was formed under the
236th Searchlight Training Rgt at
Oswestry from a
cadre provided by 53rd S/L Regiment, and shortly joined, and regimented on 12 August 1941. On 18 February 1942, the regiment had a small name change, to become the
53rd Searchlight Regiment, Royal Artillery (Royal Northumberland Fusiliers). By December 1941 the regiment had moved to
43 AA Bde, still in 7th AA Division but now deployed covering
Wearside and
Teesside. It remained under 43 AA Bde until August 1942 when it returned to 30 AA Bde
Operation Diver By late 1943, AA Command was being forced to release manpower for overseas service, particularly
Operation Overlord (the planned Allied invasion of Normandy) and most S/L regiments lost one of their four batteries. 565 S/L Battery began to disband on 25 February 1944, which it completed by 24 March. In March 1944, 30 AA Bde HQ was transferred to the south of England; 53rd S/L Rgt also went south, but joined
47 AA Bde in
2 AA Group. 2 AA Group was responsible for defending the 'Overlord' assembly camps, depots and embarkation ports and was planning for the expected onslaught of
V-1 flying bombs against London. Meanwhile, the group had to deal with a sharp increase in
Luftwaffe air raids trying to reach London, which continued until May. By mid-May 47 AA Bde was being disbanded and the regiment transferred to
44 AA Bde in
6 AA Group, which took over 2 AA Group's responsibilities for the 'Overlord' camps in the
Solent–
Portsmouth area. The regiment was attached to
38 AA Bde, which was converting into
304 Infantry Brigade. After infantry training, including a short period attached to
55th (West Lancashire) Infantry Division, the brigade was moved into the
War Office Reserve, and shipped to
Norway, landing on 7 June 1945 and joining
Norway Command following the liberation of that country (
Operation Doomsday). The regiment was still in Norway on 15 November 1945 when 638 Rgt began the process of entering suspended animation, completing the process on 13 December. == Postwar ==