In the Hebrew year 2488, Joshua sent scouts to survey Jericho in anticipation of the Jewish conquest. The mission was risky in the sense that 40 years earlier, Moses had sent scouts to Israel, only to have them recommend against entering the land. This time the mission was successful, and in the ensuing siege, Joshua's troops -- amidst shofar blasts -- encircled Jericho seven times until its walls came down. The events are recorded in the biblical Book of Joshua, chapters 2 and 6.