Thick-and-fast as the snows that fall on a winter dawn
when Zeus who rules the world brings on a blizzard,
displaying to all mankind his weaponry of war…
and he puts the winds to sleep, drifting on and on
until he has shrouded over the mountains’ looming peaks
and the headlands jutting sharp, the lowlands deep in grass
and the rich plowed work of farming men, and the drifts fall
on the gray salt surf and the harbors and down along the beaches
and only breakers beating against the drifts can hold them off
but all else on the earth they cover over, snows from the sky
when Zeus comes storming down – now so thick-and-fast
they volleyed rocks from both sides, some at the Trojans,
some from Trojans against the Argives, salvos landing,
the whole long rampart thundering under blows.

– Homer

The Iliad, Book 12, lines 323-336. The battle rages as Achaeans and Trojans continue to hurt spears and rocks at each other. An extended Homeric simile likens it to Zeus sending down a blizzard of snow from the skies, thick and fast, until it covers everything.