an Argive breakthrough –
bright as the moment Zeus the lord of lightning moves
from a craggy mountain ridge a storm cloud massing dense
and all the lookout peaks stand out and the jutting cliffs
and the steep ravines and down from the high heavens bursts
the boundless bright air…So now the Argives
drove the ravening fire clear of the warships,
winning a little breathing room, not much,
no real halt to the buck-and-rush of battle.

– Homer

The Iliad, Book 16, lines 348-356. The Achaeans manage to achieve a breakthrough in the fighting and save their ships from burning. An image of how the god Zeus shifts a storm cloud to reveal the peaks, cliffs and ravines, and the huge bright sky breaks open, is used to describe the breakthrough.