The only way that Peter Jackson could see to create the sheer volume and quantity of sound needed for the siege on Helms Deep, was to go to the local New Zealand cricket arena, and involve the rowdy crowd. During the Two Towers, the sounds had to stretch to include a greater volume of creatures at once, as the Uruk-hai army, more fierce than other orcs, and the trees of Fangorn Forest were incorporated into the trilogy.
