Ether 8:5

and they were exceeding angry because of the doings of Jared their brother, insomuch that they did raise an army, and gave battle unto Jared. And it came to pass that they did give battle unto him by night.—

They were very angry about what their brother Jared had done. So they got an army together and fought against Jared. They attacked him at night.

They were furious at what their brother Jared had done. They raised an army and attacked him under cover of night.