What memory at first darkens Henry's proud feelings after the battle? What does Henry “muster force” to do? How does he now feel about his earlier boasts about war? How does he think his experiences have changed him?

Are you referring to chapter 17. At first Henry remembers how he had ran away in battle. Henry thinks of his actions now and realizes that he has fought like a barbarian. Previous obstacles no longer seemed to be looming. He was a hero.

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