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During the Third War, Thrall's forces combined the features of a blacksmith and a lumber mill to create the War Mill, which functions both as a drop-off point for peons carrying lumber and a place where improvements are researched.
In this structure, orc smiths and troll craftsmen work side-by-side to improve the weapons and armor of the Horde armies. The attack and armor upgrades researched here affect grunts, headhunters, tauren, raiders, wyverns, and catapults.