Besides the proclamation of the New Moon, other official documents must have been despatched regularly. "Bills of divorce," for instance, needed special messengers; the whole question of the legal position of messengers is very intimately bound up with that of conveying divorces. This, however, seems to have been the function of private messengers, who were not in the strict sense letter-carriers at all. It may be well, in passing, to recall one or two other means of communication mentioned in the Midrash. Thus we read how Joshua, with twelve thousand of his warriors, was imprisoned, by means of witchcraft, within a sevenfold barrier of iron. He resolves to write for aid to the chief of the tribe of Reuben, bidding him to summon Phineas, who is to bring the "trumpets" with him. Joshua ties the message to the wings of a dove, or pigeon, and the bird carries the letter to the Israelites, who speedily arrive with Phineas and the trumpets, and, after routing the enemy, effect Joshua's rescue. A similar idea may be found in the commentary of Kimchi on Genesis. Noah, wishing for information, says Kimchi, sent forth a raven, but it brought back no message; then he sent a dove, which has a natural capacity for bringing back replies, when it has been on the same way once or twice. Thus kings train these birds for the purpose of sending them great distances, with letters tied to their wings. So we read (_Sabbath_, 49) in the Talmud that "a dove's wings protect it," i.e. people preserve it, and do not slay it, because they train it to act as their messenger. Or, again, we find arrows used as a means of carrying letters, and we are not alluding to such signals as Jonathan gave to David. During the siege of Jerusalem by the Romans, the Emperor had men placed near the walls of Jerusalem, and they wrote the information they obtained on arrows, and fired them from the wall, with the connivance, probably, of the philo-Roman party that existed within the doomed city.