Their shoulders held the sky suspended

Epitaph on an Army of Mercenaries
by A.E. Housman

These, in the day when heaven was falling,
The hour when earth’s foundations fled,
Followed their mercenary calling
And took their wages and are dead.

Their shoulders held the sky suspended;
They stood, and earth’s foundations stay;
What God abandoned, these defended,
And saved the sum of things for pay.

A nice explication here.