two significant changes occurred in 1938. firstly, artillery brigades were reorganized from three six-gun batteries to two 12-gun batteries. rather than disband existing batteries, they were instead linked in pairs. as a result, m battery was linked with p battery to form m/p battery on 11 may. the second change was that hereafter brigades were redesignated as regiments and iii brigade became 3rd regiment royal horse artillery on 27 august with d/j and m/p batteries. in the event, the batteries were unlinked within months (in september 1939) and the regiment operated with four batteries (d, j, m and p).