"across the moon like prison bars" this means that the British soldiers are like the police of the night, capturing anyone who is out late at night.
"he heard the crowing of the cock, and the barking of the farmer's dog and felt the damp of the river fog, That rises after the sun goes down" this is imagery because this is what Paul Revere is hearing while he crosses a citizens farm.
"The watchful night-wind, as it went creeping along from tent to tent, and seeming to whisper, all is well." this is personification because it is saying that the wind is saying "All is well"
"And a huge black hulk, that was magnified." this is an allusion because it is using a big black hulk to describe how big the ship is out in the harbor from the British.
"The muster of men at the barrack door" this is alliteration because it is describing how the town looks with all the angry colonists and British soldiers.
"Wrapped in silence so deep and still" this means that Paul Revere is so still and quiet that no one can hear or see him.