Actually Saruman, to my understanding, was breeding not Orcs and men for Uruk-Hai, but he was breeding Orcs with Goblin men. See,
Goblins, according to theory, were fast fighters, but they weren't as strong as the Orcs and they could move in daylight. But, Orcs, being slow but extremely strong, stronger than the Goblins could not move in daylight quickly. The Uruk-Hai Saruman bred was Goblins crossed with Orcs, so they were strong and fast and they could move in daylight at great speed. This is all according to theory, someone correct me if I am wrong please.
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Even as they spoke there came a blare of trumpets. Then there was a crash and a flash of flame and smoke. The waters of the Deeping-stream poured out hissing and foaming: they were choked no longer, a gaping hole was blasted in the wall. A host of dark shapes poured in. "Devilry of Saruman!" cried Aragorn. -Helm's Deep.
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