The True History (1.19)

They decided not to lay siege to the city; but after their return they constructed a wall across the intervening space, cutting off the Sun’s rays from the Moon. This wall was double, and built of clouds; the consequence was total eclipse of the Moon, which experienced a continuous night. This severity forced Endymion to negotiate. He entreated that the wall might be taken down, and his kingdom released from this life of darkness; he offered to pay tribute, conclude an alliance, abstain from hostilities in future, and give hostages for these engagements. The Sunites held two assemblies on the question, in the first of which they refused all concessions; on the second day, however, they relented, and peace was concluded on the following terms.