Brutus and Cassius are levying powers.
3 seconds sound clip from the Julius Caesar (1953) movie soundboard.
You can hear this line at 01:25:28 in the DVD version of the movie.
Quote context
[...]
- And having brought our treasure where we will, then take we down his load and turn him off...
- Like to the empty ass, to shake his ears, and graze in common.
- You may do your will, but he's a tried and valiant soldier.
- So is my horse, Octavius, and for that I do appoint him store of provender.
- And now, Octavius, listen great things.
- Brutus and Cassius are levying powers.
- Therefore let our alliance be combined...
[...]