The tactic was the same in the books. The uruks arrived and began pouring arrows onto and into the Helm's Deep, "but from behind the walls came no reply." I am guessing the reason was two-fold.
First, that despite the fact that thousands of heavily-armed uruk-hai were marching on their fortress, having burned and pillaged as they came, there was a policy of not initiating the attack.
Second, the more practical reasons of not wasting arrows, and waiting for good light and distance to make better use of them.
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Originally Posted by hewhoarisesinmight
Didn't one of those old guys shoot an orc and he was practically admonished!
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For firing without orders from his king or general(s).
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Originally Posted by FeRaL sHaDoW
sorry if this is off topic but why did they not bring more bombs??
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The technology wasn't so easy in Middle-Earth as it is here. They had, what? two? three? bombs at best. The bombs were filled with the concoction, which must have taken Saruman a long time to brew, so those bombs in and of themselves were quite an accomplishment.