"And it shall come to pass on that day, a great ram's horn shall be sounded." Just like a king who has long been at battle and wishes to return home, who assembles all his troops in one place to see who is missing, sounds a horn for all to assemble, and then returns home. So will it be in the redemption of the future; He will first assemble us all in the desert, to see who is missing, and then the ram's horn will be sounded for all to assemble. Even the Jews who have "strayed in the land of Assyria" and those who have lost their religion and are "in the land of Egypt" such as the anussim (Crypto-Jews) of Spain, Rome, and the like – all those within whom beats a Jewish heart.