C. H. Dudley Ward, The 56th Division (1st London Territorial Division…
“ When more than one artillery brigade was available for an infantry brigade, the necessity of keeping them écheloned in depth and maintaining all but one brigade on wheels. If resistance was encountered, the brigade, or brigades, on wheels in rear could be moved up to reinforce the artillery in the line to put down a barrage for an attack, or, if no resistance was encountered, a brigade in rear could advance through the artillery in action, which in turn could get on wheels as the advancing brigade came into action. ”
