The hum of either army stilly sounds,

That the fix'd sentinels almost receive

The secret whispers of each other's watch:

Fire answers fire, and through their paly flames

Each battle sees the other's umbered face:

Steed threatens steed, in high and boastful neighs

Piercing the night's dull ear; and from the tents

The armorers, accomplishing the knights,

With busy hammers closing rivets up,

Give dreadful note of preparation.

– WILLIAM SHAKESPEARE, KING HENRY IV, PART 2