Full of something...
It's not just Tolkien and Middle Earth where these questions are not talked about. In 1863, 150,000 plus people got together in Gettysburg Pennsylvania, one of many such meeting held in this time frame. While waste disposal was surely a problem, the Civil War academics have been able to find no records to speak of saying how it was handled.
It is well established, though, that more soldiers died of disease in the Civil war than enemy action. That's been true historically in all but the most recent conflicts.
Not that Tolkien had to push that particular theme. He had enough themes going.
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