"I can hear so well, that I can even hear the wind!"
"The watchful night-wind, as it went creeping along from tent to tent, and seeming to whisper, "All is well!" - Henry Longfellow is giving human-like characteristics to the wind by saying that it creeps and whispers.
"I feel so calm and serene."
"That he could hear, like a sentinel's trend." - Henry Longfellow is comparing his hearing to a sentinel's trend.
"This place seems a little fishy to me."
"hurry of hoofs" - Henry Longfellow says hurry of hoofs which is an alliteration to emphasize the sound of the horses.
"I will be here for you in your lowest times."
"And beneath him, tranquil and broad and deep, Is the Mystic, meeting the ocean tides" He is saying that in the quiet moment he can hear the tides.
"Gaze at him with a spectral glare," He is in the place where the battle of Lexington takes place and the atmosphere is hinting to it.
"In the hour of darkness and peril and need" Paul Revere's words will comfort America in our times of darkness.