In this episode i discuss the organisation of the Royal Artillery, from the artillery brigade right down to the gun crew. I then look at how the gun was kept supplied with shells and how batteries were split between the gun lines and the wagon lines, when they deployed for battle. I also discuss the several reorganisations of the artillery brigade, made necessary by the challenges of trench warfare. Finally, I examine the methods introduced to help spot targets and the techniques used to improve the accuracy of artillery fire; two important requirements on the battlefield.