21st Divisional Artillery Instruction 19 June 1916 SECRET 21Div. G.428 XV Corps 1 62 Inf. Bde. 5 63 : : 5 64 : : 5 Div. Art. 2 Div. Eng. 4 Pioneers 1 Signals 1 178 Tun. Co. R.E. 1 “Q” 3 A.D.M.S. 1 …