in the aftermath of the first world war, the royal horse artillery was reorganized as it returned to pre-war levels and the battery was assigned to i brigade, rha. further reductions saw the rha shrink to five brigades (of three batteries each) by march 1920; viii brigade, rha was absorbed in i brigade and, in particular, m battery absorbed aa battery on 4 january 1920 (the batteries were separated again on 11 may 1938).