But they still kept swarming round and round the corpse
like flies in a sheepfold buzzing over the brimming pails
in the first spring days when the buckets flood with milk.
So veteran troops kept swarming round that corpse.

– Homer

The Iliad, Book 16, lines 745-748. The Achaeans and Trojans fighting around the body of Sarpedon are likened to a flies swarming around pails full of milk in this extended Homeric simile.