What were the “wingéd hounds”?

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5. To wait the far-off Heraclean thaw,

Heraclean—Hercules. What chained Titan did Hercules release?

12. His purpose called him at the Big Horn’s mouth—

Locate the Big Horn. What purpose? Who was there?

18. And took the bare, foot-sounding solitude

Why “foot-sounding”?

22. He seemed indeed a fugitive from Death etc.

Another reference to Hugh’s fancy that he had actually died.