Jambha

The danavas have hidden themselves in the ocean, and from there they are destroying the world — men decay and die, sacrifices are ruined, and the gods themselves are terrified. Led by Indra, the thirty gods assemble and turn to Vaikuntha Narayana, recounting his past deeds and pleading for deliverance from the great fear that has seized them.

Ravana's followers—pishachas and rakshasas—attack the monkey army while remaining invisible. But Vibhishana knows their trick and strips their concealment away. The monkeys see them clearly, and the ambushers become the ambushed.