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So like, weren’t these guys just a week prior to this fighting an existential battle against tens of thousands of Uruks? Shouldn’t he know about how many soldiers and horses he has left and that they’re extremely depleted?
The Rohirrim were spread out dealing with raiding parties until after Helm’s Deep. Contextually we’re to understand that about half their available manpower is either dealing with other problems or just didn’t answer the muster.