content: but no sooner had they reached the grass than she vanished . the prince sought for her in vain , and at last in despair sat down on a big stone and contemplated his sad fate . as he sat thus lost in thought , he noticed an eagle flying over his head . then he suddenly bethought him of his little bell , and taking it out of his pocket he rang it once . in a moment he heard a rustling sound in the air beside him , and the king of the eagles sank at his feet .
answer: took out his little bell and rang it .
question: what did the prince do when the mare vanished ?
target: what did the prince do when the mare vanished ?
references: what did the prince do when the mare vanished ?