"No, Armagedon is New Testament stuff. But there is something in their book about Israel stretching from Egypt to the Euphrates." JtS

Right you are! However, Egypt to Euphrates refers to the Isrealite/Judean Kingdom at its greatest extent in Hebrew Bible times. not as a template for conquest of the modern Middle East, let alone of the whole world. The portion of the river noted is in the north where it passes through what is now Syria...it does not refer to the Euphrates where it courses through what is now Iraq. The Egyptian border was roughly where it is today, where the Sinai Peninsula borders Israel.