So the people shouted when the priests blew with the trumpets: and it came to pass, when the people heard the sound of the trumpet, and the people shouted with a great shout, that the wall fell down flat, so that the people went up into the city, every man straight before him, and they took the city.
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Ambrose of Milan
AD 397
And did Joshua, the son of Nun, err in recognizing the leader of the heavenly host? But after he believed, he forthwith conquered, being found worthy to triumph in the battle of faith. Again, he did not lead forth his armed ranks into the fight, nor did he overthrow the ramparts of the enemy’s walls, with battering rams or other engines of war, but with the sound of the seven trumpets of the priests. Thus the blare of the trumpet and the badge of the priest brought a cruel war to an end. - "On the Christian Faith 5.10.126"
So the walls of that city, called Jericho, which in the Hebrew tongue is said to mean moon, fell when they had been encircled seven times by the ark of the covenant. What, then, does the announcement of the kingdom of heaven portend—signified by the encircling of the ark—except that all the battlements of mortal life, that is, all the hope of this world, which is opposed to the hope of the world to come, will be destroyed by the sevenfold gift of the Holy Spirit, working through the free will? For, those walls fell of their own accord, not by any violent push of the ark in its circuit. There are other references in Scripture which suggest the church to us under the symbolism of the moon, as it makes its pilgrimage in this mortal life, amid toils and labors, far from that Jerusalem whose citizens are the holy angels. - "Letter 55"
Besides the signs just mentioned and the voices which could be heard in the neighborhood of the ark, other miraculous testimonies to the law were witnessed. For example, when the people were entering the promised land and the ark was crossing the Jordan, the river stood still above them and flowed on below them so that the ark and the people had a dry place for crossing. Again, when they came upon the first hostile city where the religion was pagan and polytheistic, the ark was carried around it seven times and then, suddenly, the walls collapsed before a hand was raised or a battering ram was used. - "City of God 10.17"
The divine reading attests that the walls of Jericho at once collapsed at the din of trumpets. So there is no doubt that the sounds of music, at the Lord’s command or with his permission, have unleashed great forces. - "Exposition of the Psalms 80.4"
Human salvation is useless, and my strength lends me no strength if I lack the strength of God. What good was the boundless vigor of giants? Or the kings of Egypt? Or mighty Jericho? Their own inflated glory was the cause of death for all of them, and God’s power broke them not by the strength of heroes but by that of the weak. The famed giant died like a dog, felled by a shepherd boy’s sling. The din of trumpets shook down the famous city. The renowned and haughty king lay dead on the sand of the shore, and the riches of the kingdom were equated with his naked corpse. So wherever Christ is with us, a web is a wall; for the person without Christ, a wall will become a web. - "Poem 16.129"