Regimental Headquarters (RHQ) was formed on 20 May 1940 at 211th AA Training Regiment (AATR) at Park Hall Camp, Oswestry, and the regiment comprised 322, 323 and 324 HAA Batteries, formed at 206th ("Arborfield), 210th (Oswestry) and 211th AATRs respectively.Frederick, pp. 757–8, 780.Farndale, Annex M.103 HAA Rgt at RA 1939–45.103 HAA Rgt War Diary 1940–41, The National Archives (TNA), Kew file WO 166/2392. Although formally part of the Territorial Army (TA) – it was the first new TA HAA unit formed after the outbreak of war – it had no territorial affiliation.
