The hum of either army stilly sounds,

That the fixed 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 armourers, accomplishing the knights,

With busy hammers closing rivets up,

Give dreadful note of preparation.

William Shakespeare (1564-1616): King Henry V. Act iv. Prologue.