Lengkepan kalimah di handap ieu: Batalyon ka-4 dipindahkeun ka Royal Engineers jeung dirobah, saméméh perang, jadi 50th (Northamptonshire Regiment) Anti-Aircraft Batalyon, Royal Engineers. Dina mimiti perang, éta ngalayanan sareng 32nd (Midland) Anti-Aircraft Brigade, 2nd Anti-Aircraft Division. Dina bulan Agustus 1940, batalion ieu dipindahkeun ka Royal Artillery sarta jadi 50th (Northamptonshire Regiment) Searchlight Regiment, Royal Artillery. Kusabab kakurangan tanaga manusa anu parah dina Grup Angkatan Darat 21st anu merangan di
Di Éropa Kalér-Kulon, hususna di infantri, resimen ieu dirobah deui jadi infantri, jadi 637th (Northamptonshire Regiment) Infantry Regiment, Royal Artillery jeung ngagabung ka 304th Infantry Brigade.