Question

what natural phenomena does the speaker use to characterize the continental army?

Answer 1

Wheatley uses these natural phenomena to create a concrete image for her readers of the victories of the American  continental army under General Washington. She sings his praises throughout, comparing Washington to the gods that she references.

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Answer 2

Tempests and rushing ocean waves are used as images to describe the Continental Army. The waves of the rushing ocean create an image of unrestrained power and rage.The lines also etch an idea of boundlessness that emphasizes the large size of the army.