Joseph Smith, Jr, founder of the Mormon movement, and George J Adams, one of his least known followers -- two Gentile dreamers of Zion -- were instrumental in encouraging Jews and Christians to support the restoration of Israel. For Joseph Smith, Jewish responsibility for establishing Zion had not been forfeited or terminated. It was continuous: the Jews would return as Jews; they would rebuild Jerusalem as Jews. In his view, neither the denigration of Jews, so often characteristic of Christianity, nor supersession by the Church, was tenable. According to Joseph's perception of the Scriptures, and his own prophetic insights, there are to be two strategic centres -- Zion at historical Jerusalem, and Zion in a New Jerusalem in the heartland of America. He believed that a renewed Israel and a church, restored to its primal purpose, shared a mandate to body forth in society the dream of the Kingdom of God. He called this dream the cause of Zion, which became a major emphasis of the Mormon movement. Adams, separated from the Mormons following the assassination of Joseph Smith in 1844, founded his own Church of the Messiah. Most of his congregations were in Maine, where he readied his followers for a mission as the "Children of Ephraim", which he explicated with persuasive skill from the Old Testament. Later he led 156 of his followers to found an agricultural and commercial colony in Jaffa, Israel. This book explains the rejection by Smith and Adams of "normal" Christian replacement theology and sets out the apologetics by which Smith and Adams promoted courage and conviction in all who joined them in encouraging the in-gathering of the Jewish exiles to Jerusalem.