When the South Wind showers mist on the mountaintops,
no friend to shepherds, better than night to thieves –
you can see no farther than you can fling a stone –
so dust came clouding, swirling up from the feet of armies
marching at top speed, trampling through the plain.

– Homer

The Iliad, Book 3, lines 10-14. The poet uses a very effective epic simile here to describe the armies marching out against each other. The dust clouds they generate is like the South Wind showering mist on the mountaintops.